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  • +1 This is a great way to explain it. However, when I calculate the APR, I get 13.2%. Either way, it is certainly not a free loan.
    – Ben Miller
    Commented Dec 24, 2014 at 18:51
  • 1
    APR is often ambiguous. I raised (1+1.10%) to the 12th power for the effective annual rate; you multiplied by 12 (I think) to get the nominal annual rate, compounded monthly...
    – DJohnM
    Commented Dec 24, 2014 at 20:36
  • @User58220 You calculated the APY.
    – Navin
    Commented Dec 25, 2014 at 1:45
  • 3
    I'd also consider the loss of use of the $21,000 for three years.
    – chili555
    Commented Dec 25, 2014 at 2:18