6120
0.2 x 0.3 x 0.4 x 400 = 9.6
$400 - 30% = 400 x (1 - (30/100)) = 400 x 0.7 = 280 dollars.
310/400 x 100 = 77.5 percent.
x * 1600 = 400 x = 400 / 1600 x = 1/4 x = 25% ■
37.5 percent of 400 --> 37.5% = 0.375; 0.375 x 400 = 150
70% of $400 = 70% x $400 = 0.70 x $400 = $280
180/400 x 100 = 45 percent.
25% x 400 = 0.25 x 400 = 100
400/100 is 4, x 12 is 48. 12% off means 400-48 which is 352
400 x .1 = 40
400 x 6.25% =25
0.005 x 400 = 2