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A firm's demand function is given by

P = 100 - 4√Q - 3Q

(a) Write down an expression for total revenue, TR, in terms of Q

(b) Find an expression for the marginal revenue, MR, and find the value of MR when Q = 9

(c) Use the result of part (b) to estimate the change in TR when Q increases by 0,25 units from irs corrent level of 9 units and compare tis with the exact change in TR