8. A door of length 10m and breadth Im is fitted in a wall. The length of the wall is 4.5 m and the breadth is 90m(Fig11.6) Find the cost of white washing the wall, if the rate of white washing the wall is * 50per m
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Answer:
given ,
length of the door = 10m
breadth of the door = 1m
therefore, area of rectangle (door) =l×b
10×1=10m
length of the wall= 4.5m
breadth of the wall = 90m
area of wall = l×b
4.5 × 90=405m
therefor, area= area of wall- area of door
405 -10= 395m
given, cost of white washing wall per/m = 50
therefore, 50×395=19,750
tthe cost of white washing the wall is 19,750
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