Apple numbers User Manual

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Chapter 12
    Dictionary of Functions 
 
PRICEDISC
The PRICEDISC function calculates the price of a discounted security per $100 par value.
PRICEDISC(settlematuritydiscountvalue, [day-count])
 settle:  The settlement date.
 maturity:  The date when the security expires.
 discount:  The discount rate.
 value:  The redemption value on the maturity date. Expressed per $100 par value.
 day-count:  Optional; specifies the number of days per month and days per year used 
in the calculations (sometimes called the day count basis).
0 or omitted uses 30/360 (30 days for each month, 360 days in a year).
1 uses actual/actual (the number of days shown on a calendar).
2 uses actual/360 (calendar days for each month but 360 days per year).
3 uses actual/365 (calendar days for each month but 365 days per year).
4 uses 30E/360 (European 30/360).
  
PRICEMAT
The PRICEMAT function calculates the price of a security that pays interest at maturity 
per $100 par value.
PRICEMAT(settlematurityissuerateyield, [day-count])
 settle:  The settlement date.
 maturity:  The date when the security expires.
 issue:  The issue date of the security.
 rate:  The redemption value on the maturity date. Expressed per $100 par value.
 yield:  The annual yield.
 day-count:  Optional; specifies the number of days per month and days per year used 
in the calculations (sometimes called the day count basis).
0 or omitted uses 30/360 (30 days for each month, 360 days in a year).
1 uses actual/actual (the number of days shown on a calendar).
2 uses actual/360 (calendar days for each month but 360 days per year).
3 uses actual/365 (calendar days for each month but 365 days per year).
4 uses 30E/360 (European 30/360).
Examples
If cells A1:D1 contain 1/1/2000, 1/1/2001, 0.1, 100:
  
PRICEDISC(A1, B1, C1, D1) returns 90.