Percentage — CDS Elementary Mathematics PYQs

In what duration of time will ₹ 3300 become ₹ 3399 at 12% per annum interest compounded quarterly?

A reduction of 10% in the price of sugar enables a person to buy 6.2 kg more for ₹ 2790. What is the reduced price per kilogram?

Consider the following for the next two (02) items:
A person borrows a sum of ₹ 16,000 on simple interest at the beginning of a year. After 4 months, ₹ 24,000 more is borrowed at a rate of interest double the previous one. At the end of the year, the total interest on both the loans is ₹ 4800.

What is the initial rate of interest per annum?

Consider the following for the next two (02) items:
A person borrows a sum of ₹ 16,000 on simple interest at the beginning of a year. After 4 months, ₹ 24,000 more is borrowed at a rate of interest double the previous one. At the end of the year, the total interest on both the loans is ₹ 4800.

What is the ratio of the interest on the first loan to the interest on the second loan?

What is the least number of complete years in which a sum of money put out at 20% compound interest (compounded annually) will be more than doubled?

100 quintals is what percent of 10 metric tonnes?

How much will ₹ 10,000 amount to in one year's time at 4% rate of interest per annum if the interest is compounded once in every three months? (take approximate value)

There are two employees $X$ and $Y$. $X$'s salary is first increased by 12% and then decreased by 10%, and $Y$'s salary is first increased by 10% and then decreased by 12%. If their salaries at present are equal, then what was the ratio of initial salary of $X$ to initial salary of $Y$?

In a village consisting of $p$ persons, $x$% can read and write. Of the males, only $y$% can read and write. Of the females, only $z$% can read and write. If $x,y>z$, then what is the number of males in the village?

A Question is given followed by two Statements I and II. Consider the Question and the Statements.

Question:
If the price of petrol goes up by 20%, by what percentage should the consumption be reduced so that the expenditure remains the same?

Statement-I: Price of petrol per litre was Rs. 90

Statement-II: Consumption was 24 litre before price hike

Which one of the following is correct in respect of the above Question and the Statements?