Please help with an explanation of how to do these questions for labor economics.

Present Value 1. Suppose Mallory lives for two periods, t = 1, 2. In period 1, she could either directly enter the labor force and earn $30,000, or she could enroll in college where her costs would be $45,000. In period 2, Mallory will either earn $30,000 if she chose to enter the workforce in period 1, or $120,000 if she went to college in the first period.[e) At what discount rate would Mallory be indifferent between directly entering the labor [4 pts] force and going to college? Call this rate ri. (f) How does Mallory's optimal decision change depending on the relationship between her (4 pts] discount rate " and ry? That is, what is Mallory's choice if r rid