$1 = 5copies means
$5 = 25 copies obviously
then
$x = 100 copies
100 / 5 = $x
so she needs
$20
Answer: B
Explanation:
$1 -> 5 copies, it's 20 cents per copy because $1 / 5 = 0.2
$5 -> 25 copies, it's 20 cents per copy because $5 / 25 = 0.2
So 100 copies * 20 cents = $20