nineteen and a half
assuming question means percent
130 x 15/100 = 130 x 3/20 = 13 x 3/2 = 39/2 = 19.5
though 15 x 130 = 1,950
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130 - 15% - 130 x (1 - (15/100)) = 130 x 0.85 = 110.5
8.6667
130 + 15% = 130*1.15 = 149.5
130 mph increased by 15% is: an increase of 19.5 mph to new speed of 149.5 mph
8.666666666666667 times.