-37.5% is the change from 488 to 305
Calculation steps:
[( 305 - 488 ) ÷ 488] x 100 = -37.5%
Formula
Percentage change = [(305 - 488) / 488] x 100
Subtract the new number by the original number
305 - 488 = -183
-183 ÷ 488 = -0.375
-0.375 x 100 = -37.5%