Multiply the figure by 1.15
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To increase a number by 15 percent, multiply the number by 1.15. For example, 60 plus 15 percent is equal to 60 x 1.15 = 69.
A 15% increase from 10.05 is: a change of 1.508 for a total of 11.56.
25%
To find 15 percent of 120, you can either calculate on your calculator 120 times 0.15=18 or you can calculate in your head 120 x .15 = 18. Either way they both work.
Step 1: Calculate 15% of 130 15% of 130 = (15/100) × 130 = 19.5 Step 2: Add the increase to the original value 130 + 19.5 = 149.5 mph