A coat costs 120 dollars before 30% off and then 5% tax. Which calculation does NOT give the final price by the discount-then-tax method?

الشرح

The correct multipliers are 0.70 and 1.05, so 120 × 0.70 × 1.05 = 88.20; the 5% tax applies to the already-discounted price of 84. The wrong 0.75 comes from netting the signed rates as 1 - 0.30 + 0.05, which treats both changes as if they used the original price.