# Changing Cash Flow Entries - HP 12C Platinum Owner's Handbook Manual

And problem-solving guide.

66

## Changing Cash Flow Entries

To change a cash flow amount:
1. Key the amount into the display.
2. Press ?.
3. Key in the number of the register containing the cash flow amount to be
changed.
To change the number of times a cash flow amount occurs consecutively –
that is, to change the N
1. Store the number of that cash flow amount (that is, j) in the n register.
2. Key the number of times the cash flow amount occurs consecutively
into the display.
3. Press ga.
Note:
If you change the number in the n register in order to change an N
be sure to reset the number in the n register to the total number of cash
flow amounts originally entered (not including the amount of the initial
investment CF
). If this is not done, NPV and IRR calculations will give
0
incorrect results.
Example 1: With the cash flows now stored in the calculator, change CF
\$11,000 to \$9,000, then calculate the new NPV for a 13½% return.
Keystrokes
9000?2
13.5¼
fl
a
This step is necessary in this example because we have calculated IRR since the first
time we calculated NPV. The IRR calculation replaced the 13.5 we keyed into i before
calculating NPV with the result for IRR – 13.72.
Since this NPV is negative, the investment would decrease the financial value of
the investor's assets.
Example 2: Change N
from 2 to 4, then calculate the new NPV.
5
Keystrokes
5n
4ga
7n
fl
for a CF
:
j
j
Display
Stores the new CF
9,000.00
a
Stores i
13.50
The new NPV.
–644.75
Display
Stores j in the n register.
5.00
Stores the new N
4.00
Resets the number in the n register
7.00
to its original value.
–1,857.21 The new NPV.
,
j
from
2
in R
.
2
2
.
5