Question

a classroom is 6.8m long 3.5m wide and 270cm high find the cost of plastering the 4 walls and ceiling at the rate of 12per m^2

Answer 1

Area of four walls + area of ceiling = 2h(l+b) + lb
=2*2.7(6.8+3.5) +6.8*3.5
=2*2.7*10.3+ 23.8
= 55.62+23.8
=79.42
Cost of plastering =79.42*12
= 953.04