66.7%
It changed by 10. 10 is 66.7% of 15.
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25% off 20 - 15 = 5 5 / 20 = 25 / 100 = 25%
25% increase from 12 to 15. 20% decrease from 15 to 12.
15% of 25 = 15% * 25 = 0.15 * 25 = 3.75
it would be 15/25 *100 for the percent... it would be 60%
25% of 15kg= 25% * 15= 0.25 * 15= 3.75kg