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Let’s assume the breadth of the rectangle is x. Then, the length of the rectangle is 20% more than its breadth, which is 1.2x. The area of the rectangle is given by length multiplied by breadth, which is (1.2x)(x) = 1.2x^2. The side of the square is equal to the breadth of the rectangle, which is x. The area of the square is given by side squared, which is x^2. Therefore, the ratio of the area of the rectangle to the area of the square is (1.2x^2)/(x^2) = 1.2. So, the ratio of the area of the rectangle to the area of the square is 1.2.