APPLICATION [22 marks] 1. A store sells 81 digital music players at $115 each, and 73 DVD players at $95 each. Determine the sales and price vectors. Also, using vector tools, determine the total revenue from sales [4] 2. Find the volume of the parallelepiped defined by u = [1, 0, 4], v = [2, 5, 0], and W = [0, 2, 3]. [5] 3. A bicycle pedal is pushed downwards by a 93 N force, making an angle of 460 with the pedal. The shaft of the pedal is 20 cm long. Determine the magnitude of the torque vector to one decimal place. [2]