In: Accounting
An equipment can be purchased at $3,500 by cash, or through a payment plan that requires an initial down payment of $1,200, and 24 end-of-month payments of $110. At what effective interest rate are these terms equivalent?
Cash purchase price | $ 3,500.00 | |||
Credit purchase option | ||||
Down payment | $ 1,200.00 | |||
Installment ($110*24 month) | $ 2,640.00 | |||
$ 3,840.00 | ||||
Excess amount charged in 2 year | $ (340.00) | |||
Equivalent rate must be where $3,500= PV of $3,840 | ||||
We have to calculate IRR for the same. | ||||
Now, say IRR is 12% p.a. i.e.1% p.m. | ||||
Present value= $110*PVIF+$1200*PVAF | ||||
Present value= $110*21.2434+$1200*1= $3,536.77 | ||||
Now, say IRR is 14% p.a. i.e.1.167% p.m. | ||||
Present value= $110*PVIF+$1200*PVAF | ||||
Present value= $110*20.8269+$1200*1= $3,490.96 | ||||
IRR as per interpolation method=12%+(3536.77-3500)/(3535.77-3490.96)*(14%-12%) | ||||
IRR as per interpolation method=12%+(0.80272)*(2%)= 12%+1.6054%= 13.6054% | ||||
Effective interest rate is 13.6054% per annum or 1.13% per month at which these terms are equivalent | ||||
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