How do you solve this: $32 earrings marked up 80 percent

80 percent what? off? that's what 80% was??

Formula for markup

sales price = original price * (1 + rate)

So in this case it would be ...

sp = $32 * (1 +.80)

$32 * (1.80)

sp = $57.60

formula for discount (if you need it)

sales price = original price * (1 - rate)

Just remember that the rate is the percentage (to convert to a percentage to a decimal just move the decimal two places to the left)