Let's turn these into decimals.
so, 10.
0.75
0.50=1/2
0.40
0.20=1/5
In order from least to greatest, these would be:
0.2, 0.4, 0.5, 0.75, 10
y=-3x
The sale price is 75% of the regular price.
Therefore, the sale price is 0.75 * 100 = 75% of the regular price.
#SPJ2