3 Anya makes T-shirts. The matrix, M, shows the number of T-shirts of different types she makes in one week. M= (10 25 30 20 40 25) (a) Anya sells all of these T-shirts to a shop. She charges $5 for each small T-shirt, $6 for each medium T-shirt and $8 for each large T-shirt. Represent these amounts in a 3 # 1 column matrix N. (b) (i) Work out P = MN. (ii) Explain what the elements in matrix P represent. (c) The shopkeeper sells all sizes of men’s T-shirts at $10 each. He sells all sizes of women’s T-shirts at $9.50 each. He sells all of these T-shirts. (i) Work out (10 9.50) (10 25 30 20 40 25). (ii) Work out the percentage profit the shopkeeper makes when he sells all of the T-shirts.