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I'll give this my best shot...although I'm not sure of the answer

m = .08/12 = (1/150)

P = $3500

n = 2 years

a  = 12 payments per year

So...the monthly payment is

3500(1/150) [ (1 + 1/150)^(12 * 2)] / [ (1 + 1/150)^(12 * 2)  - 1 ]  ≈ $158.30

If this is the monthly payment...then the total payment is  24 * 158.30  = $3799.20

[ If anyone  else is more familiar with this....please point out any mistakes !!! ]

Congrats. That is exactly the monthly payment and the total payback.