Hi Anonymous,

posed as it is, the question can be interpreted in several ways:

- If one person starts to work now, while the other one attends college, when do their
**lifetime** incomes meet if a) you exclude the cost of college or b) you include the cost of college?
- If one person starts to work now, while the other one attends college, when do their
**annual **incomes meet?

I assume that it's No. 1b (makes most sense). The tricky part comes from rising annal salaries. Also, it's not entirely well defined what "in 10 years" means. *After 10 years of working *(what I am assuming) or in 10 years from today. But in the end it's relatively straightforward. Mathematically it would be a couple of integrals that need to be solved for time.

They should look something like this (assuming 4 years of college):

LI(x) = Lifetime Income

t = Time

LI(c) = (-30 * 4) + 60 * (t-4) + 4 * (t-4) | for all t > 4

LI(nc) = 40 * t + 3.5 * t

LI(c) = LI (nc)

You'd be surprised how long it takes (assuming that income growth will remain the same)...

(edited)