The function is defined in terms of $100 par value, but there is nothing about the bond calculations that is inherently tied to the US Dollar.

Recommend the use of the generic currency sign here (U+00A4)

page 2623, line 22 Part 4, Section 3.17.7.101 DURATION

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Proposed Disposition of DIS 29500 Comment FR-0454 (Modified: 2007-12-06) We agree that the functions described in Part 4, §3.17.7.91 (DISC), page 2,616; Part 4, §3.17.7.101 (DURATION), page 2,624; and Part 4, §3.17.7.206 (MDURATION), page 2,709 are unnecessarily tied to the US Dollar, and, as such, the following changes will be made to those sections of the specification: Part 4, §3.17.7.91, page 2,616, line 21 and page 2,617, after line 2 3.17.7.91 DISC Arguments: Name Type Description settlement number The security’s settlement date. maturity number The security’s maturity date. pr number The security’s price per $ 100 currency units face value. redemption number The security’s redemption value per $ 100 currency units face value. basis number The truncated integer type of day count basis to use, as follows: Value Day Count Basis 0 or omitted US (NASD) 30/360 1 Actual/actual 2 Actual/360 3 Actual/365 4 European 30/360 Time information in the date arguments is ignored. The currency units of pr and redemption are assumed to be the same currency. Part 4, §3.17.7.101, page 2,623, lines 22­24 3.17.7.101 DURATION Description: Computes the Macaul e a y duration for an assumed par value of $ 100. Duration is defined as the weighted-average of the present value of the cash flows and is used as a measure of a bond price’s response to changes in yield. term to maturity of the cash flows from a bond. The weight of each cash flow is determined by dividing the present value of the cash flow by the price. Duration is used as a measure of a bond price’s response to changes in yield. … Return Type and Value: number ­ The Macauley Macaulay duration for an assumed par value of $ 100. Part 4, §3.17.7.206, page 2,708, line 8 3.17.7.206 MDURATION Description: Computes the modified Macauley Macaulay duration for a security with an assumed par value of $ 100. … Return Type and Value: number ­ The modified Macauley Macaulay duration for a security with an assumed par value of $ 100. Similar Comments: CA-0055 , CL-0149 , CL-0151 , CL-0191 , CO-0182 , CO-0185 , CO-0195 , FR-0472 , FR-0516 , GB-0396 , GB-0399 , GB-0415 , US-0193 , US-0196 , US-0212