Question

Find the cost of painting the outer surface of a closed box which is 60cm long, 40cm broad and 30cm high at the rate of 50 paise per cm(sq)

Answer 1

Area =2 (lb+lh+bh)
=2 (60*40+60*30+40*30)
=10800 cm square
Cost of painting=10800*50 paisa
=540000 paisa
=5400 rupees
Hope it helps