I need help with my assignment please

Megamart, a retailer of consumer goods, provides the following information on two of its departments (each considered an investment center). Investment Center Electronics Sporting goods Sales $ 9,900,000 8,100,000 Net Average Income Invested Assets $ 547,500 $ 3,650,000 798,000 5,700,000 1-a. Compute return on investment for each department. Return on Investment Choose Numerator: 1 Choose Denominator: Return on Investment Net income Sales Return on investment Electronics Sporting Goods Assume a target income level of 11.9% of average invested assets. Compute residual income for each department. Investment Center Electronics Sporting Goods Net income Target net income Residual income