Question 271643
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Find the cost of painting the outer surface of 24 oil containers at $2.50 per square meter, 
the dimensions of each container being 60 centimeters by 40 centimeters by 56 centimeters.
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        As I read the solution in the post by @mananth, I was shocked.

        He writes "There are 8 faces in a cuboid 4 faces will have same area. The other four faces will have same arae."


        In opposite, a cuboid has 6 faces, and opposite faces have equal areas.


        So, the @mananth solution is a fatal nonsense.


        I came to bring a correct solution.



<pre>
If a rectangular box has dimensions L (the length), W (the width) and H (the height), then
its surface area is

    S = 2*(LW + LH + HL).


In our case, L = 60 cm = 0.6m;  W = 40 cm = 0.4 m;  H = 56 cm = 0.56 m,  and

    the surface area is  2*(0.6*0.4 + 0.6*0.56 + 0.40*0.56) = 2*0.8 = 1.6 m^2.


So, the cost of the painting is $2.50 times 1.6,  or 4 dollars.    <U>ANSWER</U>
</pre>

Solved correctly.