Question: 3. 4 = (3 3 ) and B - (2 3 ). find: (1) 24 -3B (3 marks) (ii) BA (3 marks) (b) Given matrix

3. 4 = (3 3 ) and B - (2 3 ). find: (1) 24 -3B (3 marks) (ii) BA (3 marks) (b) Given matrix A= _ ), find: (i) determinant A, det ( A ) (3 marks) (ii) A-1 (3 marks) 4. (a) Find the original price of a diamond ring if the selling price after 30% discount is RM20,000. (3 marks) (b) Let C(x) and R(x) represent a cost function and a revenue function respectively, where x is the number of units of a certain product. At break-even point, C(x) = R(x). Find the values of x, correct to the nearest whole number, for the following products where the cost and revenue functions are as listed below. C(x) = 85x+1155 and R(x) =105x (3 marks) (c) Suppose that RM9,000 is deposited for 6 years in an account paying 8.31% per year compounded annually. (0) Find the compound amount. (3 marks) (ii) Find the amount of interest earned.

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