If a cost total needs to be reduced by a 9% discount, what should that total be multiplied by?

A.
91/100

B.
9/100

C.
109/100

D.
9/10
A. 91/100
To calculate the reduced total after applying a 9% discount, you should multiply the original total by 91/100. Therefore, the correct answer is option A.
To calculate the cost total after a 9% discount, you need to multiply the cost total by a decimal equivalent of the discount rate. This is because a 9% discount means you are subtracting 9% of the cost total from the original amount.
To find the decimal equivalent of 9%, you divide the percentage value by 100. So for a 9% discount, the decimal equivalent is 9/100 or 0.09.
Now, to calculate the cost total after the discount, you need to multiply the original cost total by the decimal equivalent of the discount rate:
Original cost total * Decimal equivalent of discount rate = Discounted cost total
In this case, the original cost total needs to be reduced by a 9% discount. So you would choose option A, which is 91/100.