Karina bought a camera with a regular price of $89. it was on sale at a 20% discount. there was a 7% tax on the sale price. how much did karina spend to buy the camera?

1) we can calculate the price of this camera with 20% discount.
$89-(20/100)($89)=$89-0.2($89)=$89-$17.8=$71.2

2) now, we apply the tax on the sale price.
$71.2 + (7/100)($71.2)=$71.2+(0.07)($71.2)=$71.2+$4.984=$76.184

Karina spent to buy the camera $76.184.

What exactly is your question?