Final answer:
When comparing alternatives using IRR and MARR, choose the lower-cost alternative to maximize the present worth of benefits or outputs.
Step-by-step explanation:
When comparing alternatives using the internal rate of return (IRR) and the minimum acceptable rate of return (MARR), the lower-cost alternative should be chosen when IRR is less than MARR.
This is because the goal is to maximize the present worth of benefits or outputs.
By choosing the lower-cost alternative, the present worth of benefits is maximized, resulting in a more efficient use of resources.