-45.01% is the change from 491 to 270
Calculation steps:
[( 270 - 491 ) ÷ 491] x 100 = -45.01%
Formula
Percentage change = [(270 - 491) / 491] x 100
Subtract the new number by the original number
270 - 491 = -221
-221 ÷ 491 = -0.45010183299389
-0.45010183299389 x 100 = -45.01%