Wings Limited develops and sells off$-$the$-$shelf accounting software packages. The retail price of each package is $$660($GST inclusive$).$ Included with each package sold are 'free' upgrades for a period of $12$ months from the date of sale. These upgrades can be purchased separately for $$77($GST inclusive$).$ At the date of sale, Wings should record revenue of:

Question $5$Select one:

a$.$

$$583\mathrm{.}00.$

b$.$

$$530\mathrm{.}00.$

c$.$

$$737\mathrm{.}00.$

d$.$

$$660\mathrm{.}00$