HP 12c Solutions Handbook page 143

R -R : Unused
5 .3
1. Key in the program, (Note: If the average cost are not going to be calcu-
lated, lines 25 through 48 need not be keyed in).
2. To calculate r, the learning factor, if C
a. Key in C
b. Key in C
c. Key in n, the number of units and press
learning factor.
3. To calculate the cost of the nth unit when C
a. Key in C
This step may be skipped if step 2 has just been done).
b. Key in the number of units, n and calculate C
unit by pressing
4. To calculate the average cost per unit of the ith through jth unit, C
and r are known.
a. Key in C
This step may be skipped if step 2 has just been done).
b. Key in the number of the last unit of the batch, j and press
c. Key in the number of the first unit of the batch, i, and calculate the
average cost per unit by pressing
Example 2: The electronic manufacturer cited in example 1 found that the
100th instrument actually cost $395 to manufacture. Find the actual
learning factor,
r
500 thru 1000. (Recall that C
Keystrokes
875
395
100
500 16
1000
500 25
, the cost of the first unit and press
1
, the cost of the nth unit and press
n
and press
1
and press
1
.
, the cost of the 500th unit and the average cost of units
was $875).
1
Display
875.00
395.00
0.89
299.14
1000.00
280.00
and C are known:
1 n
and r are known:
1
1. Key in r and press
16 .
1. Key in r and press
Actual r.
Cost of the 500th unit.
Average cost of the 500th thru 1000th
unit.
142
.
.
to calculate r the
2. (Note:
, the cost of the nth
n
, if C
ij
2. (Note:
25 .
1