2020% is the change from 15 to 318
Calculation steps:
[( 318 - 15 ) ÷ 15] x 100 = 2020%
Formula
Percentage change = [(318 - 15) / 15] x 100
Subtract the new number by the original number
318 - 15 = 303
303 ÷ 15 = 20.2
20.2 x 100 = 2020%
Example