The contract goes for six months. At the beginning of February, 3020, you may take out:
119,500 (Monthly fee) x 6 (no. months) x 0.2 (20%) = 143,400 C-Bills
At the beginning of March, April, May, June and July you can take out:
119,500 (Monthly fee) x 6 (no. months) x 0.05 (5%) = 35,850 C-Bills
At the end of the contract, you get the rest, which is:
119,500 (Monthly fee) x 6 (no. months) x 0.55 (50% + 5%) = 394,350 C-Bills
Now, for expenses:
72,945 C-Bills per month, 110,000 C-Bills per year