Question
A room 8 m long, 6 m broad and 4m high has 2 windows of
2( 1/2) m m and 1m and a door of 2m 2(1/2) m. Find the cost of papering the walls with paper 50cm wide at the rate of 1.50 paise per metre?Solution
Surface area of four walls = 2(L + B) H                       = 2 (8 + 6)*  4                       = 112 m2 Area of 2 windows = 2 *3/2 = 3 m2 Area of door = 2 *5/2 = 5 m2 Wall paper to be papered = 112 – 3 – 5 = 104 m2 Paper = 50cm = 
 m Area of the papered = L* B 104 = L 
  L = 208 m 
Cost= 208Â * 1.50 = Rs 312
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