3) Reginella plc, a manufacturer of concrete, produces four grades of concrete for 500,000 cubic yards at a joint cost of 2,000,000. Information for each grade is as follows: Grade A B C Cubic Yards 75,000 200,000 100,000 125,000 Sales Value 375,000 1,200,000 700,000 850,000 What is the gross profit of Grade D concrete, if the constant gross margin percentage method is used? a) 306,000 b) 1,125,000 c) 544,000 d) 900,000 5 Ma Total 40 Ma