1971.43% is the change from 42 to 870
Calculation steps:
[( 870 - 42 ) ÷ 42] x 100 = 1971.43%
Formula
Percentage change = [(870 - 42) / 42] x 100
Subtract the new number by the original number
870 - 42 = 828
828 ÷ 42 = 19.714285714285715
19.714285714285715 x 100 = 1971.43%