Calendar: discount, 75%, sale price, $2.25, find the orignal sale price

Not sure if it was discounted by 75% or it ended up 75% of original

if it was discounted by 75%
100-75=25
25%=2.25
times 4 both sides
100%=$9.00

if it was 75% of the original price
75%=2.25
divivde both sides by 3
25%=0.75
times  4 both sides
100%=$3.00

if it was discounted by 75% then original is $9.00
if it was 75% of original price after discount then original is $3.00