Sharp el-9950

71
Chapter 4: Graphing Features
The example can be expressed as a sequential equation, as
follows:
u
n
= u
n–1
× (1 – 0.6) + 3000
where
u
n
is the balance of the current month and
u
n–1
is the balance
of the previous month, and n is the month.
CONCEPT
1. Grasptheideaofsequentialequations.
2. Use the graph tracing function to obtain approximate values.
Youhavejustopenedyourownbankaccount,
with an initial deposit amount of 2000 Euro.
Supposeyourmonthlyincomeis3000Euro,
and you will spend 60 percent of what you have
in the account every month, how much will your
balancebeafteroneyear?Howmuchwillyou
have in the account, 6 months from now?
2. Try it!