59.38% is the change from 320 to 510
Calculation steps:
[( 510 - 320 ) ÷ 320] x 100 = 59.38%
Formula
Percentage change = [(510 - 320) / 320] x 100
Subtract the new number by the original number
510 - 320 = 190
190 ÷ 320 = 0.59375
0.59375 x 100 = 59.38%