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PERBALAN.BAS
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BASIC Source File
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1988-10-07
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2KB
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45 lines
100 'Periodic Balance ("PERBALANCE")
110 CLS
120 COLOR 0,15 : PRINT "Periodic Balance" : COLOR 15,0
130 DEFDBL A-Z
140 DEFINT M-N
150 MONEYFMT$ = "$$##,###,###.##"
160 PRINT
170 PRINT "Do not enter dollar signs or commas"
180 PRINT
190 ' Let user enter data
200 INPUT "Starting balance: ", SBALANCE
210 INPUT "Deposit each period: ", DEPOSIT
220 INPUT "Annual interest rate (in percent): ", AR
230 INPUT "Number of years: ", NYEARS
240 INPUT "Number of deposits per year: ", NPY
250 INPUT "Annual inflation rate (in percent): ", INFLATION
260 INPUT "Marginal tax rate (in percent): ", TAXRATE
270 ' Initialize values
280 PR = (1 + AR / 100) ^ (1 / NPY) - 1 'Interest rate per period
290 PR = PR * (1 - TAXRATE / 100) 'After-tax interest rate
300 ' Find balance at end of term
310 TOTALYEARS = TOTALYEARS + NYEARS
320 EBALANCE = SBALANCE * (1 + PR) ^ (NYEARS * NPY)
330 IF PR <> 0 THEN EBALANCE = EBALANCE + DEPOSIT * ( (1 + PR) ^ (NYEARS * NPY) - 1 ) * (1 + PR) / PR ELSE EBALANCE = EBALANCE + NYEARS * NPY * DEPOSIT
340 'Adjust for inflation
350 ADJUSTEDBAL = EBALANCE * ( (1 + INFLATION / 100) ^ (1 / NPY) ) ^ (-TOTALYEARS * NPY)
360 ' Print results
370 PRINT
380 PRINT "Year: "; TOTALYEARS
390 PRINT "Final balance "; TAB(30); USING MONEYFMT$; EBALANCE
400 PRINT "Inflation-adjusted balance "; TAB(30); USING MONEYFMT$; ADJUSTEDBAL
410 ' Let user continue additional periods
420 PRINT
430 PRINT "Enter Y to continue, N to stop"
440 K$ = INKEY$: IF K$ = "" THEN GOTO 440 ELSE IF INSTR("YyNn", K$) = 0 THEN GOTO 430
450 IF K$ = "N" OR K$ = "n" THEN END
460 CLS
470 'Let user enter new data
480 INPUT "Deposit each period: ", DEPOSIT
490 INPUT "Annual interest rate (in percent): ", AR
500 INPUT "Number of additional years: ", NYEARS
510 SBALANCE = EBALANCE 'Starting balance is previous final balance
520 GOTO 280 'Repeat calculations
530 END