66.79% is the change from 521 to 869
Calculation steps:
[( 869 - 521 ) ÷ 521] x 100 = 66.79%
Formula
Percentage change = [(869 - 521) / 521] x 100
Subtract the new number by the original number
869 - 521 = 348
348 ÷ 521 = 0.6679462571976967
0.6679462571976967 x 100 = 66.79%