Question

The length of the rectangle is increased by 10%.

The width of the rectangle is increased by 5%.
Find the percentage increase in the perimeter of the rectangle.

(please look at the photo) ​

Answer 1

length_20 cm breadth_30 cm

Explanation:

width of the rectangular_ 5/:. length of rectangular_10/:. primeter of rectangular_? now perimeter of rectangular_2(l+b). 2(20+30) __100#

Answer 2

8% increase

Explanation:

The length after the increase:

30 x 1.1 = 33cm

The width after the increase:

20 x 1.05 = 21cm

New perimeter:

2(33 + 21) = 108 cm^2

Old perimeter:

2(30 + 20) = 100 cm^2

Percentage increase of area:

108 / 100 = 1.08 = 8% increase