Question

Describe two methods for finding the sale price of an item that is discounted 30%. which method do you prefer? Explain.

Answer 1

one can take the price of the item before the discount is applied and subtract that from the percentage off and get the cost of the item.

I find this is the most effective way.

another method could be if one turned the percentage into a decimal it could be subtracted from the cost of the item.

Answer 2

1. Find the value of the discount amount, and subtract from the original.

2. Find the value of the item after discount by using 100%-30%.

I prefer the second, as it is faster.

Explanation:

1. Find the value of the discount amount, and subtract from the original.

Say y is the amount you pay after the discount, and x is the original price, the calculation will look like this:

The value of the discount is 30% of x, which is equal to 0.3x.

subtract that from the original value to find y:

y = x - 0.3x

2. Find the value of the item after discount by using 100%-30%.

The amount left over after subtraction thirty % is 70%

Thus,

y = 0.7 x