Solve this:
Q.29. A municipal corporation wall on road side has dimensions as shown in given figure. The wall is to be used for advertisements and it yields an earning of Rs. 660 per $m^2$ in a year. Find the total amount of revenue earned in a year.

First find area of triangle by heron's formula
Ans. will be 40.98 cm^2 ----#1

Then find area of rectangle using L*B
Ans. 42 cm^2 ----#2

Now add #1. & # 2.
Ans. 82.98 cm^2

Convert it to m^2 by dividing it by 10,000
Ans. 0.008298 m^2

Now multiply it with our price per m^2
0.008298 * 660

FINAL ANSWER : ₹5.47.