Question 1126677
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Material cost of a web camera is five eighth of {{{highlight(cross(toatal))}}} <U>total</U> cost and labour cost is one third of material cost.
If labour cost is $15 what is the total cost of the web camera.
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<pre>
1.  The labor costs 1/3 of the material cost; and the labor costs $15.


    Hence, the material cost 3 times $15, i.e. 45 dollars.




2.  The material costs 5/8 of the total cost;  from the other side, it costs $45.


    Hence,  1/8 of the total cost is 1/5 of $45, i.e. $9.


    Then the total cost of the web-camera is 8 times $9, i.e.  8*9 = 72 dollars.



<U>Answer</U>.  The total cost of the web-camera is 72 dollars.
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Easy mental solution.