WBCS Mains 2020 Official Paper-VI

A number is increased by $10\%$ and then decreased by $10\%$, then the number

A man invests $\text{Rs. }5000$ at a rate of $6\%$ per annum. How much more should he invest at a rate of $9\%$, so that he can earn a total of $7\%$ per annum?

A sum of money compounded annually becomes $\text{Rs. }500$ in two years and $\text{Rs. }550$ in three years. The rate of interest per annum is

The areas of two similar triangles are $36\text{sq.cm}$ and $81\text{sq.cm}$ respectively. If the median of the smaller triangle is $12\text{cm}$ then the corresponding median of the larger triangle is

If the rate of compound interest for the first year is $4\%$ and for the second year is $5\%$, then the compound interest on $\text{Rs. }25,000$ for $2$ years is