1093.98% is the change from 83 to 991
Calculation steps:
[( 991 - 83 ) ÷ 83] x 100 = 1093.98%
Formula
Percentage change = [(991 - 83) / 83] x 100
Subtract the new number by the original number
991 - 83 = 908
908 ÷ 83 = 10.939759036144578
10.939759036144578 x 100 = 1093.98%