HP HP-11C - Page 37

Section 2: Memory Stack, LAST X, and Data Storage
Example: A bacteriologist tests a
certain strain of microorganisms
whose population typically increases
by 15% each day (a growth factor of
1.15). If he starts a sample culture of
1000, what will be the bacteria
population at the end of each day for
five consecutive days?
35
Method: Use to put the constant growth factor (1.15) in the
Y-, Z-, and T-registers. Then put the original population (1000) in
the displayed X-register. Thereafter, you calculate the new daily
population whenever you press [x]. To set your calculator to the
same display format as is shown in the following example, press
(FIx]2.
T=| 0.00 0.00 0.00 1.15 1.15
Z=%| 0.00 0.00 1.15 1.15 1.15
Y | 0.00 1.15 1.15 1.15 1.15
X¥| 1.15 1.15 1.15 1.15 1,000
Keys=® 1.15 [ENTER] [ENTER] [ENTER] 1000
T=| 1.15 1.15 1.15 1.15 1.15
Z=%| 1.15 1.15 1.15 1.15 1.15
Y| 1.15 1.15 1.15 1.15 1.15
X %1,150.00/1,322.50|/1,520.88/1,749.01]/2,011.36
Keys =
When you press the first time, you calculate 1.15 X 1000. The
result (1,150.00) is displayed in the X-register, the stack drops, and