উত্তর সিলেক্ট করলে সঠিক ও ভুল দেখাবে।
ব্যাখ্যা ও সঠিক সমাধান
উত্তর:
20%
Let the actual and written price be A and S respectively.
Selling price at 6.666% gain = A + 6.666% of A = 1.0666A
Selling price at 20% commission or written price = S - 20% of S = S - 0.2S = 0.8S
Selling price at 6.666% gain = Selling price at 20% commission on written price
or, 1.066A = 0.8S
or, S = 1.066A/0.8 = 1.33325A
Selling price at 10% commission = S - 10% of S = S - 0.1S = 0.9S
So, gain at 10% commission on written price = (0.9S - A) / A x 100%
= (0.9 ×1.33325A - A) / A × 100% = (1.2A - A) / A × 100% = 0.2 × 100% = 20%