Asked by jil

peg has $30 to spend at the book store. Her coupon is 15% off but she pays 5% tax. what is the most expensive book she can buy?
Answered by Reiny
.85(1.05)x = 30
x=30/(.85(1.05)) = $33.61
Answered by jil
where did you get 1.05 from
Answered by Reiny
100% + 5% salestax = 1 + .05 = 1.05

to increase something by 5% , just multiply it by 1.05
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