A toy merchant announces 25% rebate in prices of balls. If one needs to have a rebate of Rs. 40, then how many balls each costing Rs. 32, he should purchase ?

Answer: Option A

Rebate on one ball :
= 25% of Rs. 32
= Rs. $$\left(\frac{25}{100}\times 32\right)$$
= Rs. 8
∴ Required number of balls :
= $$\frac{40}{8}$$
= 5