29% is the change from 300 to 387
Calculation steps:
[( 387 - 300 ) ÷ 300] x 100 = 29%
Formula
Percentage change = [(387 - 300) / 300] x 100
Subtract the new number by the original number
387 - 300 = 87
87 ÷ 300 = 0.29
0.29 x 100 = 29%
Example