A coolie deposits Rs 150 per month in his post office Savings Bank account. If this is 15% of his monthly income, find his monthly income.

Find the number a, if

(i) 8.4% of a is 42

(ii) 0.5 of a is 3

(iii) of a is 50

(iv) 100% of a is 100

x is 5% of y, y is 24% of z. If x = 480, find the values of y and z.

Asha got 86.875% marks in the annual examination. If she got 695 marks, find the total number of marks of the examination.

Deepti went to school for 216 days in a full year. If her attendance is 90%, find the number of days on which the school was opened.