Lê Xuân Hải
20/07/2017 at 14:42
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The question must be changed to: "How much does the small boards and big boards cost all".
They all bought: \(5+3+1+2+4+6=21\left(big\right)\) boards.
They all bought: \(2+4+6+5+3+1=21\left(small\right)\) boards, too.
So it all cost: \(21.\left(486000+88000\right)=12054000\left(dollars\right)\).
So the answer is: $12.054.000
Lê Xuân Hải selected this answer.