Kenneth S. answered 02/01/18
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The effect of a 5% markup is to multiply cost (for store to acquire) a commodity by 1.05
1.05 consists of 1 + 0.05; multiplying by this number has a two-fold effect:
a) multiplying by one, i.e. keeping the original cost as part of the price, and
(b) multiplying by the number 0.05, which is the decimal value of five percent.