A closed cubical box of edge $2.5$ m is to be painted from outside at $\text{Rs.}\,40$ per m$^{2}$. The…

A closed cubical box of edge $2.5$ m is to be painted from outside at $\text{Rs.}\,40$ per m$^{2}$. The total cost is:
  1. $\text{Rs.}\,1500$
  2. $\text{Rs.}\,750$
  3. $\text{Rs.}\,1000$
  4. $\text{Rs.}\,2000$

Solution

TSA $= 6 \times 2.5^{2} = 6 \times 6.25 = 37.5 \text{ m}^{2}$. Cost $= 37.5 \times 40 = \text{Rs.}\,1500$.

Asked in: IMO

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