Find the simple interest on Rs. 5000 for 1 year at 5%.

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

Find the ratio of 50 cm to 2.5 m.

The cost of a toy car is Rs 150. If the shopkeeper sells it at loss of 10%. Find the price at which it is sold.

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