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OS/2 Shareware BBS: 10 Tools
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SAMPLES
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FINANCE.CSH
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1993-09-28
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# Calculate various financial factors related to the "time value of money".
# Copyright (c) 1989 by Hamilton Laboratories. All rights reserved.
proc PV_FutureAmount(i, n)
# Calculate the multiplier to convert $1 in period n to a
# present value, given interest rate i% per period.
return 1/(1 + i/100)**n
end
proc FV_PresentAmount(i, n)
# Calculate the multiplier to convert $1 now to a
# future value, given interest rate i
return (1 + i/100)**n
end
proc PV_Annuity(i, n)
# Calculate the multiplier to convert $1 paid each period for n periods
# to a present value, given interest rate i% per period.
return 100/i - 1/(i * (1 + i/100)**n)
end
proc FV_Annuity(i, n)
# Calculate the multiplier to convert $1 paid each period for n periods
# to a future value, given interest rate i% per period.
return ((1 + i/100)**n - 1)/i
end
proc Periods_PV(i, PV)
# Calculate the multipler to convert an annuity of $1 paid each period,
# given present value and interest rate, to a number of periods.
@ i /= 100;
return ceil(-(log(1/i - PV) + log(i))/log(i + 1))
end
proc Periods_FV(i, FV)
# Calculate the multipler to convert an annuity of $1 paid each period,
# given future value and interest rate, to a number of periods.
@ i /= 100;
return ceil(log(i*FV + 1)/log(i + 1))
end