-45.32% is the change from 770 to 421
Calculation steps:
[( 421 - 770 ) ÷ 770] x 100 = -45.32%
Formula
Percentage change = [(421 - 770) / 770] x 100
Subtract the new number by the original number
421 - 770 = -349
-349 ÷ 770 = -0.45324675324675323
-0.45324675324675323 x 100 = -45.32%