842.86% is the change from 21 to 198
Calculation steps:
[( 198 - 21 ) ÷ 21] x 100 = 842.86%
Formula
Percentage change = [(198 - 21) / 21] x 100
Subtract the new number by the original number
198 - 21 = 177
177 ÷ 21 = 8.428571428571429
8.428571428571429 x 100 = 842.86%