The length of the rectangle is 15m, and the width is 8m. By what percentage will its area increase if the width is increased by 6m?

Find the area of the rectangle with the data by the condition parameters:
S1 = a1 * b1 = 15 * 8 = 120 (m²).
After enlarging, the width of the rectangle became:
b2 = b1 + 6 = 14 (m).
Find the area after increasing the width:
S2 = a1 * b2 = 15 * 14 = 210 (m²).
Let’s make a proportion and find how many percent of the original area is the new area
120 m² – 100%
210 m² – x%
x = 210 * 100/120 = 21000/120 = 175%
The area has increased by:
175% – 100% = 75%.
Answer: the area of the rectangle has increased by 75%.