To find a given percentage of a number, multiply the number by the percentage and then divide that by 100. So, for 12% of $130, you do:
130
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25% of 130 dollars= 25% * 130= 0.25 * 130= $32.50
78 dollars.
65 dollars
15% off of $130 = $130 - (0.15 x 130) = $110.50
12 enlarged by 130% = 12*1.3 = 15.6