Orange Pty Ltd develops and sells off-the-shelf accounting software packages. The retail price of each package is $399 (GST inclusive). Included with each purchase are "free" upgrades for a period of 12 months after the date of purchase. These upgrades can be purchased separately for $80 (GST inclusive). At the date of purchase of the software package by a customer, Orange should record revenue of: Select one: O a. $290.00 O b. $362.72 O c. $399.00 O d. $319.00