17.7% is the change from 661 to 778
Calculation steps:
[( 778 - 661 ) ÷ 661] x 100 = 17.7%
Formula
Percentage change = [(778 - 661) / 661] x 100
Subtract the new number by the original number
778 - 661 = 117
117 ÷ 661 = 0.17700453857791226
0.17700453857791226 x 100 = 17.7%