Ok, after reading the small notes properly, and re-doing my numbers, here's what I get:
In FY16 the contact lense business was generating annual revenues of about $1.5 m. In the H1 period of FY17, annual revenues of about $0.87 m (^) were acquired (acquisition of Net Contacts). In the H1 period of FY18, annual revenues of $1.2 m (+) were acquired (acquisition of WebContacts and YourContacts). So pro-forma, and absent any organic growth, the business should now be generating annual revenues of $1.5m + $0.88m + $1.2m = $3.58m.
Fast forward to the H2 FY18 period, and annual revenue (in online contacts retailing) was reported at $4.5m. The reported H1 FY18 revenue was $2.0m, meaning H2 FY18 revenues were $2.5m, which crudely annualises to 2 x $2.5m = $5.0m.
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