Find the cost of papering the four walls of a room 16m long, 12m broad and 8m high, with paper 2m wide at rs 50 per metres.

$50 per square meter

the surface area of a rectangular prism with Legnth Widh and Height is
SA=2(LW+LH+WH)
so

L=16
W=12
H=8

SA=2(16*12+16*8+12*8)
SA=2(192+128+96)
SA=2(416)
SA=832 square meters

at 50 per square meter

so times 832 by 50 to get 41600

the cost is 41600 monies

Here, feel free to ask if there are any questions