The cost of painting the four walls of a room $8$ m $\times 5$ m $\times 3$ m at $\text{Rs.}\,25$ per…

The cost of painting the four walls of a room $8$ m $\times 5$ m $\times 3$ m at $\text{Rs.}\,25$ per m$^{2}$ is:
  1. $\text{Rs.}\,1950$
  2. $\text{Rs.}\,2000$
  3. $\text{Rs.}\,1500$
  4. $\text{Rs.}\,3000$

Solution

Area of four walls $= 2 h (l+b) = 2 \times 3 \times (8+5) = 78 \text{ m}^{2}$. Cost $= 78 \times 25 = \text{Rs.}\,1950$.

Asked in: IMO

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