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15 February, 01:53

Scott wants to tip his tax icad driver 20%. Lf his commute costs $15 what is the total cost

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  1. 15 February, 03:06
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    20% in decimal form (and the form we need to do math with) is 20/100 or 0.20 (because there's 20 units for every cent; 20 for every hundred).

    You multiply 15 (the total cost) by 0.20 to get 20% of 15, then add 15 to 20% of 15 to get the total cost.

    0.2 (15) + 15 = 18

    This works because you are multiplying 15 by one fifth of its value (20%) then adding the actual cost to it.
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