Question

On buying 12 notebooks, Andrew obtained an overall discount of $\$10$. If he paid $120, which of the following equations can be used to find the cost of each notebook (m)?

• A. 12m = 120
• B. 12m - 10 = 120
• C. 12m + 10 = 120
• D. 12(m - 10) = 120

Answer 1

The correct option is B 12m - 10 = 120

Let m be the cost of each notebook.
Cost of 12 notebooks = 12m
Discount $=\$10$
The amount Andrew has to pay = 12m - 10
Thus,
12m - 10 = 120.