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70% of 400= 70% * 400= 0.7 * 400= 280
(1-0.30)*400 0.7*400 280 ■
680... Think of it like 70 percent of 100 is 70. So times this by 4 equals 280. So plus 280 to 400 and youve got 680!
30% off of 400 dollars = 70% of 400 dollars = 400*70/100 = 280 dollars
$400 - 30% = 400 x (1 - (30/100)) = 400 x 0.7 = 280 dollars.