Question

A jersey is on sale for 10% off. Find the sale price if the original price of the jersey was $100.

Answer 1

Start by writing the sales price as function

`y=k(1-x)`

in which y is the sales price, k is the original price and x is the discount percentage in decimal form.

`y=100\cdot(1-0.1)`

solve for y

`\begin{gathered} y=100\cdot(1-0.1) \\ y=100\cdot0.9 \\ y=90 \end{gathered}`

The sales price will be $90