User Manual

PV: Unused PMT: Unused

FV: Unused R

: Unused

: S

: n

: a R

: b

: c

-R

: Unused

1. Key in the program and press CLEAR .

2. Divide the data points to be input into 3 equal consecutive groups. Label them Groups I,

II and III for convenience.

3. Key in the first point of group I and press

4. Key in the first point of group II and press

5. Key in the first point of group III and press

6. Repeat steps 3, 4, and 5 for the balance of the data in each group. After executing step 5

the display shows how many sets of data have been entered.

7. To fit the data to a Gompertz curve, press

12 . The resultant display is the

curve constant "a". Constants "b" and "c" may be obtained by pressing

6 and

7 respectively.

8. To calculate a projected value, key in the number of the period and press

9. Repeat step 8 for each period desired.

Example: The X-presso Company marked a revolutionary new coffee brewing

machine in 1968. Sales grew at a steady pace for several years, then began to

slow. The sales records for the first 9 years of the product's life were as follows.

Year Sales ($K)

1 18

2 41

3 49

4 151

5 188

6 260

7 282

8 322

9 340

What are the projected sales volumes for this product in its 10th and 12th year?

What is the maximum yearly sales volume for this product if the present trend