121% is the change from 300 to 663
Calculation steps:
[( 663 - 300 ) ÷ 300] x 100 = 121%
Formula
Percentage change = [(663 - 300) / 300] x 100
Subtract the new number by the original number
663 - 300 = 363
363 ÷ 300 = 1.21
1.21 x 100 = 121%
Example