99.7% is the change from 335 to 669
Calculation steps:
[( 669 - 335 ) ÷ 335] x 100 = 99.7%
Formula
Percentage change = [(669 - 335) / 335] x 100
Subtract the new number by the original number
669 - 335 = 334
334 ÷ 335 = 0.9970149253731343
0.9970149253731343 x 100 = 99.7%