The width of the rectangle is 12cm and the length is 15% longer than the width. Find the area of the rectangle.

To solve this problem, remember that in order to find the percentage of the number, you need to multiply this number by the percentage and divide by one hundred. Let’s calculate 15% of 12.
12 * 15/100 = 12 * 0.15 = 1.8.
We calculate the length of the rectangle, knowing that it is 1.8 cm more than the width. The width is 12 cm.
a = 12 + 1.8 = 13.8 cm.
The area of the rectangle is equal to the product of the length and the width. S = a * b, where a is the length and b is the width.
S = 13.8 * 12 = 165.6 cm ^ 2.
Answer: 165.6 cm ^ 2.