A mixed number is a whole number plus a fraction, so it must be more than '1'.
15% is less than '1', so there's no way it can be a mixed number.
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17/8 = 15/8
To increase a number by a certain percent, multiply it by (1 + n/100). For example, to increase a number by 15 percent, multiply it by (1 + 15/100), or 1.15. To decrease a number by 15 percent, multiply it by (1 - 15/100), or 0.85.
15% = 0.15
28
100.