
Emilee F. answered 07/23/18
Tutor
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10+ Years of Tutoring Experience, Specializing in Math & Science
Let x equal the marked price of ramen.
The 18% discount is equal to x - 0.18x, or 0.82x
The service charge, when applied to the discounted ramen price, is 0.1(0.82x)
The GST, when applied to the discounted ramen price, is 0.07(0.82x)
The GST, when applied to the discounted ramen price, is 0.07(0.82x)
Since she paid all 3 of these, and it totaled to 10.13, you can add them together to get this equation:
0.82x + 0.1(0.82x) + 0.07(0.82x) = 10.13
Combine the terms to get: 0.9594x = 10.13
Divide by 0.9594 to get: x = 10.55
Divide by 0.9594 to get: x = 10.55
So, the original price of the ramen was 10.55.