Question

A square room is 4 m high. The area of its floor is 144 sq. m. Find the cost painting its four walls inside at the rate of ₹ 2.50 per sq. m.​

Answer 1

Answer:

area =144, now a^2=144, a=12 m we know that area of four wall= 4ah, therefore area of four wall=4×12×4=192 meter square,now total cost=192×2.50=490 rupeya

Answer 2

Answer:

₹ 480

Step-by-step explanation:

Height of square room = 4m

Area of square room = 144 sq m

side ^2 = 144 sq m

Length of wall (s):

s = root 144

length of side = 12m

Area of 1 wall:

height × length

4 × 12

Area of 1 wall = 48 sq m

Area of 4 walls = 48 × 4 = 192 sq m

Rate of cost of painting wall = ₹ 2.50/sqm

Cost of painting walls:

Area of 4 walls × Rate of cost of painting

192 × 2.50

Cost of painting dour walls = ₹ 480