Question

a cuboidal box is 2 metre long 1 m broad and 0.5 m high find the cost of painting its outer surface at the rate of rupees 200 per m square

Answer 1

total surface area of boxe=2(lb+bh+hl)=2(2×1+1×0.5+0.5×2)=2(2+0.5+1)=2×3.5=7m^2
rate of per metre square=200rs
rate of 7metre square=7×200=1400rs