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A firm produces two types of calculators...

A firm produces two types of calculators each week, x number of type A and y number of type B. The weekly revenue and cost functions (in rupees) are R(x,y) `=80 x + 90 y + 0.04 xy - 0.05x^(2) - 0.05y^(2)` and `C(x,y) =8x + 6y + 2000` respectively.
(i) Find the profit function P(x,y).
(ii) Find `(del P)/(del x)(1200, 1800)` and `(del P)/(del y) (1200, 1800)` and interpret these results.

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