Explanation:

Let’s break down the solution:

- B purchases: 15 kg apples (as per wholesaler's balance), but each “kg” is only 950g.

- Total actual apples received: 15 × 950g = 14,250g = 14.25 kg actual apples.

- Cost price: 15 × ?180 = ?2,700.

- B sells at: ?180 per kg, but his “kg” is only 750g.

- Total ‘kgs’ sold (as per B’s weight): 14,250g ÷ 750g = 19 “kgs” (units sold).

- Total selling price: 19 × ?180 = ?3,420.

Profit = Selling Price – Cost Price = ?3,420 – ?2,700 = ?720

Profit % = (Profit / Cost Price) × 100 = (720 / 2700) × 100 = 26.67%

Option 4: 26.67%

- Other options:

- 22.55%, 25.75% and 33.33% do not match the calculated value.

- The right strategy is: Always convert weights to actual quantity before profit calculation.

- B’s profit is due to both buying and selling with less than a kg per labeled “kg”.

Correct Answer: Option 4: 26.67%