A man sold 20 apples for Rs. 100 and gained 20%. How many apples did he buy for Rs. 100?

Given:

A man sold 20 apples for Rs. 100 and gained 20%

Concept used:

Profit% = \( \dfrac{SP - CP}{CP} \) × 100

SP = Selling Price

CP = Cost Price

Calculation:

⇒ 0.2CP = 100 - CP

⇒ 1.2CP = 100

⇒ CP = Rs. 83.34

CP of 1 apple = \(\dfrac{83.34}{20} \) = Rs. 4.167

Number of apples he can purchased from Rs. 100 = \(\dfrac{100}{4.167}\) = 24 Apples

∴ For Rs. 100, he can purchase 24 Apples.