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40 out of 400 is the same as 4 out of 40 or 1 out of 4 or 1/4 (one fourth). Which is 25%.
10%
40% of 400 = 400*40/100 = 160
40% = 400
$400 x 40% = $160
40% of 400kg= 40% * 400= 0.4 * 400= 160kg
10% of 400 is 40.
400
40
400%
10% x 400 = 40 400-40= $360
10% of 400 = 10% * 400 = 0.1 * 400 = 40