A room is 8m long ,6m wide and 3.5m high. Find the cost of white washing its four walls at the rate of 50 per square meter.

4900

Step-by-step explanation:

Length = 8m.

Width = 6m

Height = 3.5m

Area of the walls will be:

= 2(l × h) + 2(w × h)

= 2(8 × 3.5) + 2(6 × 3.5)

= 2(28) + 2(21)

= 56 + 42.

= 98m²

Since the rate is given as 50 per square meter, the cost of whitewashing its four walls will be:

= 50 × 98.

= 4900

b is the correct answer