Question

A room is 7.5 m long, 5.5 m broad and 5 m high. What will be the expenditure in covering the walls by paper 40 cm broad at the rate of 80 paise per metre ?

Answer 1

Area of four walls = $2.5\times (7.5+5.5)$

$=130m^2$

Area of required papers = $130m^2$

Breadth of paper = 40 cm = $\frac{40}{100}$m=0.4 m

Area = $l\times b$

$130=l\times 0.4$

length = $\frac{130}{4}=325m$

Cost of paper at 80 p per meter = $325\times 0.80$

$=Rs260$