Answer: C
20% profit means: When the selling price is ₹120, the cost price is ₹100 \(\therefore\) If the selling price is ₹500, then the cost price is ₹\(500 \times \frac{100}{120}\) 10% loss means: When the cost price is ₹100, the selling price is ₹90 \(\therefore\) If the cost price is ₹\(500 \times \frac{100}{120}\), then the selling price is \(\quad ₹500 \times \frac{100}{120} \times \frac{90}{100} = ₹375\)
20% profit means: When the selling price is ₹120, the cost price is ₹100 \(\therefore\) If the selling price is ₹500, then the cost price is ₹\(500 \times \frac{100}{120}\) 10% loss means: When the cost price is ₹100, the selling price is ₹90 \(\therefore\) If the cost price is ₹\(500 \times \frac{100}{120}\), then the selling price is \(\quad ₹500 \times \frac{100}{120} \times \frac{90}{100} = ₹375\)