You need to expand your %grocerytotals hash. It needs to be a HoH. i.e.

my %grocerytotals( 'Eggs' => {quantity => 0,
                              total    => 0});
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That way you can update the value for the quantity key and the total key when they add a new item. Does this make some sense?

edit or you could just implement the price key in that HoH as well and keep all the datatucked in a %grocery hash.

my %grocery = ('Eggs' = > {quantity => 3,
                           price    => 1.45});
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Then you can just compute the total via the printout, unless you want to store it.. in which case you would just add the total key back to the hash