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
Answer: Karina spent to buy the camera $76.184.