(12C) Payback Period in Cash Flows

[Carsen]

Well that's embarrassing ;-). Let me rephrase that.

"It would also be radical if somebody could post how long the program takes to get the answer on a classic HP-12C made in the 1980's."

Okay. Here's how the cash flow (CF) problem would be entered into the 12C.

[ f ] CLEAR REG
-79,000 [ g ] [CF0] Stores the initial investment. The initial investment is in the description above the table. Initial investment starts in year 0.
14,000 [ g ] [CFj] Year 1 CF
11,000 [ g ] [CFj] Year 2 CF
10,000 [ g ] [CFj] You get the idea
3 [ g ] [Nj] The CF of $10,000 appears a consecutive number of 3 times.
9,100 [ g ] [CFj]
9,000 [ g ] [CFj]
2 [ g ] [Nj]
4,500 [ g ] [CFj]
100,000 [ g ] [CFj]. Then press [R/S]. Answer should be 7.66 yrs.