HP 15c - Manual (Page 27)

Section 1: Using _ Effectively 27

If a problem has a specified interest rate of 0, the program generates an Error 0
display (or Error 4 when solving for PMT).

Problems with extremely large (greater than 10
6
) or extremely small (less than 10
−6
)
values for n and i may give invalid results:

Interest problems with balloon payments of opposite signs to the periodic payments
may have more than one mathematically correct answer (or no answer at all). This
program may find one of the answers but has no way of finding or indicating other
possibilities.
Keystrokes Display
|¥ Program mode.
´CLEARM 000-
´bA 001-42,21,11 n routine.
O1 002- 44 1 Stores n.
¦ 003- 31
G1 004- 32 1 Calculates n.
|K 005- 43 36
l*0 006-45,20, 0
l5 007- 45 5
® 008- 34
- 009- 30 Calculates
PV – 100 PMT A/i.
|K 010- 43 36
l+3 011-45,40, 3 Calculates PV + 100 PMT A/i.
|~ 012- 43 20 Tests PMT = −PV i/(100 A).
t0 013- 22 0
÷ 014- 10
” 015- 16
|T4 016-43,30, 4 Tests x ≤ 0.
t0 017- 22 0
|N 018- 43 12
l6 019- 45 6
|N 020- 43 12
÷ 021- 10
O1 022- 44 1
|n 023- 43 32
´bB 024-42,21,12 i routine.
O2 025- 44 2 Stores i.
¦ 026- 31
. 027- 48
2 028- 2