37.83% is the change from 378 to 521
Calculation steps:
[( 521 - 378 ) ÷ 378] x 100 = 37.83%
Formula
Percentage change = [(521 - 378) / 378] x 100
Subtract the new number by the original number
521 - 378 = 143
143 ÷ 378 = 0.3783068783068783
0.3783068783068783 x 100 = 37.83%