One side of the rectangle is 12 inches and the other side is 30% of the length of the first.

One side of the rectangle is 12 inches and the other side is 30% of the length of the first. Find the perimeter and area of this rectangle.

If one side of the rectangle is 12 inches and the other is 30% of the length of the first side, then the length of the other side is (30 * 12 inches) / 100 = 3.6 inches.
It is known that if the sides of the rectangle are equal to a and b, then the perimeter (P) and area (S) are calculated by the formulas: P = 2 * (a + b) and S = a * b.
For our example, a = 12 dm and b = 3.6 dm. Therefore, P = 2 * (12 dm + 3.6 dm) = 2 * 15.6 dm = 31.2 dm; S = 12 dm * 3.6 dm = 43.2 dm2.
Answers: The perimeter of the rectangle is 31.2 dm2, and the area is 43.2 dm2.