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Percentage Practice Questions - Page 3

Questions 21–30 of 49 · Page 3 of 5

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Questions
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Q21In an examination, 40% students failed in Physics and 32% students in Chemistry, 20% students failed in both the subjects. If the number of students who passed the examination was 960 (by passing both the subjects), how many students appeared in the examination consisting only of these two subjects?MediumSolve →Q22A machine depreciates in value each year at the rate of 10% of its previous value. However, every second year there is some maintenance work so that in that particular year, depreciation is only 5% of its previous value. If at the end of the fourth year, the value of the machine stands at RS. 1,46,205, then find the value of machine at the start of the first yearMediumSolve →Q23The price of soap is collectively decided by five factors: raw materials, research, labour, advertisements and transportation. Assume that the functional relationship is Price of soap = (k’ × Raw material costs × Research costs × labour costs × Advertising cost × Transportation cost). If there are respective changes of 20%, 20%, -20%, 25% and 10% in five factors, then find the percentage change in the price of soap.MediumSolve →Q24The price of a certain product was raised by 20% in indi(a) The consumption of the same article was increased from 400 tons to 440 tons. By how much percent will the expenditure on the article rise in the Indian economy?MediumSolve →Q25In the university examination last year, Samanyu scored 65% in English and 82% in History. What is the minimum percentage he should score in Sociology, which is out of 50 marks (if English and history were for 100 marks each), if he aims at getting 78% overall?MediumSolve →Q2610% of Mexico’s population migrated to South Asia, 10% of the remaining migrated to America and 10% of the rest migrated to Australia(a) If the female population, which was left in Mexico, remained only 3,64,500, find the population of Mexico City before the migration and its effects if it is given that before the migration the female population was half the male population and ratio did not change after the migration?MediumSolve →Q27In a village consisting of p persons, x% can read and write. Of the males alone y%, and of the females alone z% can read and write. Find the number of males in the village in terms of p, x, y and z if z < y.MediumSolve →Q28The cost of food accounted for 25% of the income of a particular family. If the income gets raised by 20%, then what should be the percentage point decrease in the food expenditure as a percentage of the total income to keep the food expenditure unchanged between the two years?MediumSolve →Q29Aman’s salary was first increased by 25% and then decreased by 20%. The result is the same as Baman’s salary increased by 20% and then reduced by 25%. Find the ratio of Baman’s initial salary to that of Aman’s initial salary.MediumSolve →Q30P is 50% more than Q, R is 2/3 of P and S is 60% more than R. Now, each of P, Q, R and S has increased by 10%. Find what percent of Q is S (after the increase)?MediumSolve →
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