121. In an examination, 80% students passed in Hindi, 70% in English while 15% failed in both the subjects. If 455 students passed in both the subjects, then find the total number of students who appeared in the examination ?
122. After receiving two successive raises, Ankit’s salary became equal to \(\frac{{15}}{8}\) times of his initial salary. By how much % was the salary raised first time if the second time it was raised twice as high as the first.
123. A spends 30% of his salary on house rent, 30% of the rest on items of daily use and 24% of the total salary he spends on children’s education. After his expenditure, he is left with Rs. 2500. What is salary of A ?
124. During winters, A can run ‘y’ meters on one bottle of glucose. But in the summer, he can run only ‘0.5y’ meters on one bottle of glucose. Then how many bottle of glucose are required to run 1000 meters during summer ?
125. A’s monthly salary is x rupees. Of this he spends y rupees. The next month he has an ↑ of z% in his salary and p% on his expenditure. Then what will be the new amount saved.
126. The ticket price in a cinema worth Rs. 160. When the price of the ticket lowered, the sale of the ticket ↑ by 50% while the collection recorded a decrease of 17.5%. Find the deduction in the ticket price.
127. The population of a city depreciates each year at the rate of 10% of its previous year value. However, every second year it depreciate at the rate of 5% of its previous value. If at the end of fourth year, the population of the village is 204687. Then find the population at the start of first year.
128. In a school 70% of the students are boys & the rest are girls. Further \( \boldsymbol{12\frac{6}{7}} \)% of the boys and 10% of girls are getting a fee waiver. If the number of those getting a fee waiver is 90, find the total number of students getting 50% concession if it is given that 50% of those not getting a fee waiver are eligible to get half fee concession ?
129. Out of the total procuction of copper from chalcopyrite, an ore of copper, 30% of the ore gets wasted, and out of the remaining ore, only 10% is pure copper. If the pure copper obtained in a year from a mine of chalcopyrite was 70000 kg, then the quantity of chalcopyrite mined from that mine in that year will be how much ?
130. A man buys a taxi for Rs. 350000. The annual repair cost comes to 3% of the price of purchase. Besides he has to pay an annual tax of Rs. 5000. At what monthly rent must he rent out the taxi to get a return of 20% on his net investment of the first year.
131. In the year 2005, the car industry had two car manufacturers – Maruti and Mahindra with market shares of 25% and 75% respectively. In year 2006, the overall market for the product increased by 50% and a new player Audi entered the market and captured 15% of the market share. If share of maruti increased to 50% in the second year, then what was the share of Mahindra in that year ?
132. Ankit, a businessman, earned a profit of 50% and donated 50% of total capital (initial capital + profit) in the first year. The same course was followed in the 2ⁿᵈ year and 3ʳᵈ year. If he is left with 14445 Rs, then find amount donated by Ankit at the end of second year.
133. A fraction is such that if the double of the numerator and the triple of the denominator is changed by +10% and -10% respectively then we get 121% of \(\frac{{100}}{{27}}\). Find the fraction.
134. The hourly wages of a labour are increased by \(12\frac{1}{2}\)% wheareas the weekly working hours are reduced by 8%. Find the % change in the weekly wages if she was getting Rs. 1500 per week for 60 hours previously.
135. If salary of a person is increased by Rs. 50000 and the rate of tax is decreased by 2% from 12% to 10%. If in both the cases 28% of the income is tax free then find the increased salary.
136. Price of a commodity is first increased by y% and then decreased by y%. If the new price is \(\frac{M}{{100}}\), find the original price.
137. The ratio of Amit’s salary for January to his salary for february was 1.5 : 1.333 and the ratio of the salary of february to that for march was 2 : 2.6666. The worker got 30 rupees more for march than for january and received a bonus consituting 30% of the salary of three months. Find the bonus.
138. A’s salary is first increased by 10% and then decreased by 20%. The result is same as B’s salary increased by 20% and reduced by 10%. Find the ratio of B’s salary to that of A’s.
139. 10% of delhi’s population migrated to mumbai, 10% of the remaining migrated to Goa and 10% of the rest migratef to calcutta. If the male population, which was left in Delhi, remained only 437400, find the population of Delhi city before the migration and its effects if it is given that before the migration the male population was half the female population and this did not change after migration.
140. To pass an examination 40% marks are essential. A obtained 20% less marks than the pass marks and B obtained 25% marks less than A. What percent less than sum of A’s and B’s marks should C obtain to pass the exam ?