266.9% is the change from 142 to 521
Calculation steps:
[( 521 - 142 ) ÷ 142] x 100 = 266.9%
Formula
Percentage change = [(521 - 142) / 142] x 100
Subtract the new number by the original number
521 - 142 = 379
379 ÷ 142 = 2.6690140845070425
2.6690140845070425 x 100 = 266.9%