8000/120= 67 days (or 11 years)
Now you can easily buy a horse with parchment from thedirect salesfor under 5.000e.
5000/120=42 (or 7 years)
So you just bought a horse with parchment for 5.000e and it's 10 years old. That means in 120 days you will be the proud owner of a pass horse.
120x120e= 14.400e profit just from the parchment 14400e-5000= 9.400e straight profit
45e per day from lessons
11e per day boarding
15e per day feeding (averaged out over the seasons)
45- (11+15) = 19e profit per day
19e x 120 days = 2.280e profit
9400 + 2280 = 11,680 total profit at age 30 + free pass