130 - 15% - 130 x (1 - (15/100)) = 130 x 0.85 = 110.5
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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
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
180 - 130 = 50
89 pounds minus 15% = 85% of 89 pounds = 89*85/100 pounds = 75.65 pounds