Section 8: Program Branching and Controls 97
Now run the program to find the total amount needed in an account from
which you want to take $250/month for 48 months. Enter the periodic
interest rate as a decimal fraction, that is, 0.005 per month. First find the
sum needed if payments will be made at the beginning of the month
(payments in advance), then calculate the sum needed if payments will be
made at the end of the month (in arrears).
Payment periods (4 years × 12
months).
Monthly interest rate as a
decimal fraction.
Deposit necessary for
payments to be made in
advance.
Deposit necessary for payment to
be made in arrears. (The
difference between this deposit
and the tuition cost ($12,000)
represents interest earned on the
deposit!)
Further Information
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In contrast to the nonprogrammable sequence t “ nnn, the
programmable sequence t label cannot be used to branch to a line
number, but only to program label (a line containing ´ b label).
*
Execution continues from the point of the new label, and does not return to
the original routine unless given another t instruction.
t label can also be used in Run mode (that is, from the keyboard) to
move to a labeled position in program memory. No execution occurs.
*
It is possible to branch under program control to a particular line number by using indirect addressing,
discussed in section 10.
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