exam Maths Puzzle Numerical Ability

Elaine was charged $288 interest for 1 month on a $1600 credit card balance. What was the monthly interest rate?
Is this right?
18%

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exam Other Question

maximize the value of R=y+1/2x ,subject to the constraints x greater than or = to y greater than or = and x+y less than or = 4 (x)/(x^2+9x+20) - (4)/(x^2+7x+12) I am having trouble with this problem.

Thanks for any help
Rhee