From what you wrote, according to your table:
For every $100 you borrow at 8%, you pay $3.69 each month for 30 months.
So, you pay back a total of 3.69 x 30 = $110.70
But, if you borrow 2700, using your table you find that:
2700 / 100 = 27
27 * 3.69 = 99.63
So you pay back 99.63 x 30 = $ 2988.90