exam Maths Puzzle Numerical Ability

the perimeter of a rectangular field is 120 m. if the length of the field is twice thw breadth find the cost of manuring the field at the rate of Rs. 200 per 100 square metre.

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what is the function rule if:
x f(x)
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-2 8
-3 27
-4 64 Maximize the objective function C = 3x + 2y with the constraints x + 2y<- 4, x - y <- 1, x >- 0, y >- 0.