Posted by Ak on Tuesday, November 3, 2009 at 12:43am.
Assistance needed.
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Let the number of $2 increases be n
Now:
number of rooms = 210
cost per room = 45
cost of cleaning= 210(5)
After increase:
number of rooms = 210 - 3n
cost per room = 45 + 2n
cost of cleaning = 5(210-3n)
profits = (210-3n)(45+2n) - 5(210-3n)
= ...
expand the above, then express as a simplified quadratic.
If you know Calculus, differentiate and set equal to zero to solve for n
If you are doing these by completing the square, do so.
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