138.00 + (15%) = 158.70
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To increase a number by 15 percent, multiply the number by 1.15. For example, 60 plus 15 percent is equal to 60 x 1.15 = 69.
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Not exactly. Cost x 1.15 is the total of the original cost plus the 15 percent addition. If cost was $1.00, c x 1.15 would be $1.15. 15 percent of cost is only the 15 cents.
It might be easier to use the percent equation rather than the percent proportion when you are multiplying and dividing.
The answer can not be specific if your question isn't. A possible answer is 138x100.