B purchased 15 kg apples at the rate of ₹180 per kg from a wholesaler who uses a weight of 950 grams for the kg weight. B sold all these apples at ₹180 per kg but used a weight of 750 grams for the kg weight. Find the percentage profit earned by B in the transaction (correct to 2 places of decimal).

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**Solution:**

1. **Given:**
   - Price per kg = ₹180
   - Wholesaler uses 950 g as 1 kg weight
   - B uses 750 g as 1 kg weight while selling
   - Total apples purchased = 15 kg (actual weight as per wholesaler's 950 g kg)

2. **Calculate the actual quantity B receives:**
   - B pays for 15 kg at ₹180/kg, but each kg is actually 950 g.
   - So, actual weight B receives:
     $$15 	imes 950 	ext{ g} = 14250 	ext{ g} = 14.25 	ext{ kg}$$

3. **Calculate cost price (CP) for B:**
   - B pays ₹180 per kg for 15 kg (as per wholesaler's kg)
   - Total cost price:
     $$15 	imes 180 = ₹2700$$

4. **Calculate selling price (SP) for B:**
   - B sells apples at ₹180 per kg but uses 750 g as 1 kg.
   - Total actual weight B has = 14.25 kg
   - Number of 'kg' units B sells (using 750 g as 1 kg):
     $$\frac{14250 	ext{ g}}{750 	ext{ g}} = 19 	ext{ kg (units)}$$
   - Total selling price:
     $$19 	imes 180 = ₹3420$$

5. **Calculate profit:**
   - Profit = SP - CP = ₹3420 - ₹2700 = ₹720

6. **Calculate profit percentage:**
   $$	ext{Profit \%} = \frac{720}{2700} 	imes 100 = 26.67\%$$

**Answer:** 26.67\%

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