Answer:
18.90
Step-by-step explanation:
3x12=36
36-15=21
21 x 0.9
$19.65
12*3=36
15*.09=1.35
15+1.35=16.35
36-16.35=$19.65
Here's what i did:
I broke down the fraction entirely.
3 / 5 = 6 / 10
divide 6 by two and divide 18 by two. This makes 3 / 10 = 9.
divide 3 by three and 9 by three, making 1 / 10 = 3.
if you need 7 / 10 of the number (30) then do 3*7.
The answer is 21.
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