100 x 40 = 4,000
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40 x 2.5 = 100
To find what number multiplied by 40 equals 100, you can set up the equation ( 40x = 100 ). By dividing both sides by 40, you get ( x = \frac{100}{40} = 2.5 ). Therefore, 40 times 2.5 equals 100.
It is: (56-40)/40 times 100 = 40% increase
It is: 13/40 times 100 = 32.5%
Multiply it by 100: 17/40 times 100 = 42.5%