The width of the rectangle is 40 cm; its length is 135% of the width. Find the perimeter and area of the rectangle.

To solve this problem, remember, 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 the length of the rectangle, knowing that it is 135% of its width. The width is 40 cm.
40 * 135/100 = 40 * 1.35 = 54 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 = 54 * 40 = 2160 cm ^ 2.
The perimeter of a rectangle is the sum of the lengths of all its sides. Since in a rectangle the opposite sides are equal, then P = 2 * (a + b), where a is the length, b is the width.
P = 2 * (54 + 40) = 2 * 94 = 188 cm.
Answer: 188 cm, 2160 cm ^ 2.