Answer:
The legal rate to quote is 31.88% per year
The effective annual rate is 36.98%
Explanation:
In calculating the legal rate, I used the rate function in excel,whose formula is below:
rate(nper,-pmt,pv)
The nper is the period of loan calculate as 1 year multiplied by 12 months
pmt is the periodic monthly loan repayment of $3838.25
pv is the today's value of the loan at $39000
Find detailed computation in the attached spreadsheet.