6413.33% is the change from 15 to 977
Calculation steps:
[( 977 - 15 ) ÷ 15] x 100 = 6413.33%
Formula
Percentage change = [(977 - 15) / 15] x 100
Subtract the new number by the original number
977 - 15 = 962
962 ÷ 15 = 64.13333333333334
64.13333333333334 x 100 = 6413.33%