Accounting help please

The following selected data pertain to the belt division of Allen Corp. for last year: Sales $2,000,000 Avenge operating assets $500,000 Net operating income $300,000 Turnover 4.0 Minimum required return 18% How much is the residual income? a. $0 b. $1,500,000 c. $210,000 d. $300,000 How much is the return on investment? a. 60% b. 33% c. 18% d. 15% A ___ cost is one that has already been incurred and that cannot be avoided regardless of what action is chosen. a. sunk b. opportunity c. mixed d. variable