Answer:
$125
Step-by-step explanation:
You can write an equation from the problem statement:
$80 = 0.64 × (total cost)
This is solved by dividing by 0.64.
$80/0.64 = $125 = (total cost)
_____
Of course, you know that ...
64% = 64/100 = 0.64
Both fractions are read as "sixty-four hundredths."