The first step is to represent the percentages as a fraction. To do this, divide the number of percent by one hundred.
40% = 40/100 = 0.4.
Let’s calculate what the length is, knowing that 0.4 of it is a decimetres. To do this, we must divide the number a by 0.4.
a / 0.4 cm.
Let’s calculate what the area of the rectangle is. To do this, multiply the length by the width.
S = a / 0.4 * a = a² / 0.4 cm².
Answer: a² / 0.4 cm².
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