Apple Numbers '08 - Manual (Page 227)

Chapter 12 Dictionary of Functions 227
DDB
The DDB function calculates the depreciation of an asset based on a specified
depreciation rate. If you don’t specify a rate, it defaults to the double-declining balance
method.
DDB(cost, salvage, life, period, [factor])
 cost: The initial cost of the asset.
 salvage: The salvage value of the asset.
 life: The number of periods over which the asset is depreciating.
 period: The period for which you want to calculate the depreciation. Must use the
same time units as life.
 factor: Optional; a number that determines the depreciation rate. The higher the
number, the more rapid the depreciation. If omitted, 2 (for double-declining) is
assumed.
DEGREES
The DEGREES function converts radians to degrees.
DEGREES(radians)
 radians: A number representing the size of the angle in radians.
Examples
DDB(1000, 100, 4, 1) returns $500.
DDB(1000, 100, 4, 2) returns $250.
DDB(1000, 100, 4, 3) returns $125.
DDB(1000, 100, 4, 4) returns $25.
DDB(1000, 100, 4, 1, 1) returns $250.
DDB(1000, 100, 4, 1, 3) returns $750.
DDB(1000, 100, 4, 2, 3) returns $150.
DDB(1000, 100, 4, 3, 3) returns $0.
Examples
DEGREES(PI()) returns 180 (pi radians = 180 degrees).
DEGREES(1) returns 57.2957795130823, which is approximately the number of degrees per radian.