1650% is the change from 18 to 315
Calculation steps:
[( 315 - 18 ) ÷ 18] x 100 = 1650%
Formula
Percentage change = [(315 - 18) / 18] x 100
Subtract the new number by the original number
315 - 18 = 297
297 ÷ 18 = 16.5
16.5 x 100 = 1650%
Example