Answer :

Start by writing the sales price as function

[tex]y=k(1-x)[/tex]

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

[tex]y=100\cdot(1-0.1)[/tex]

solve for y

[tex]\begin{gathered} y=100\cdot(1-0.1) \\ y=100\cdot0.9 \\ y=90 \end{gathered}[/tex]

The sales price will be $90

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