4. A room is 9 m long, 6 m wide and 4 m high. Find the cost of plaster

1.	4. A room is 9 m long, 6 m wide and 4 m high. Find the cost of plastering its walls and ceiling atthe rate of Rs 2-50 per square metre.
Answer» Total surface area=2(lb+bh+hl)=2(96+64+49)=2(54+24+36)=2(114)=228m^2Hence total cost will be 2282.5=570rupees we have to find surface area of only 5walls because ceiling and plastering can be done on 5walls

4. A room is 9 m long, 6 m wide and 4 m high. Find the cost of plastering its walls and ceiling atthe rate of Rs 2-50 per square metre.

Answer»

Total surface area=2(lb+bh+hl)=2(9*6+6*4+4*9)=2(54+24+36)=2(114)=228m^2Hence total cost will be 228*2.5=570rupees

we have to find surface area of only 5walls because ceiling and plastering can be done on 5walls