d. Residual Income with Neither = $4,335,000 – (0.10 × $28,900,000) 4,335,000 – 10% × 28,900,000 = 1,445,000
= $1,445,000
The manager will choose to invest in both the air conditioner and the turbocharger
In this case, the minimum required return on investment, 10%, is lower than the
ROIs of both projects. Therefore, both projects are profitable, and the highest
residual income is earned by investing in both.