There are 25 computers in a school. Out of them 16 are working. Find the percentage of computers which are working.

20 The present population of a town is 12500 and it is increasing at the rate of 8% per annum. What will be the population of the town after 2 years? 1

Convert the following ratios to percentages.

(a) 3 : 4 (b) 2 : 3

3

72% of 25 students are good in mathematics. How many are not good in mathematics?

4

Find the ratio of 50 cm to 2.5 m.