To increase an amount by 15 percent, you should multiply it by 1.15. This is because 1 represents the original amount, and 0.15 represents the 15 percent increase. For example, if you have an amount of $100, multiplying it by 1.15 results in $115, which reflects the 15 percent increase.
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To increase a number by a certain percent, multiply it by (1 + n/100). For example, to increase a number by 15 percent, multiply it by (1 + 15/100), or 1.15. To decrease a number by 15 percent, multiply it by (1 - 15/100), or 0.85.
Multiply the amount by 0.15
To increase a number by a certain percent, multiply it by (1 + n/100). For example, to increase a number by 15 percent, multiply it by (1 + 15/100), or 1.15. To decrease a number by 15 percent, multiply it by (1 - 15/100), or 0.85.Read more: http://wiki.answers.com/How_do_you_increase_a_number_by_a_percent#ixzz17Zw2XWuo
To convert 15 to percent multiply by 100: 15 × 100 = 1,500 %
to calculate the percent increase . first = 25 - 10 = difference between the two numbers = 15 then divide this differnece by the original starting number (which is 10)= 15 divided by 10 = 1.5 to make this a percent increase multiply by 100 . so you result is 1.5 x 100 = 150% to summarise: ((final number- starting number) / starting number) x 100 = percent increase