[Oden]

work - Definition from Longman English Dictionary Online

if a cost or amount works out at a particular figure, it is found to be that much when you calculate it
work out at/to £10/$500 etc
The bill works out at £15 each.

What does each mean here? Is the word necessary in the sentence?

[susan53]

It means for each person. For example if it was a restaurant bill for four people, it would mean the total bill was £60.

You could say either : ... at £15 each or ...at £15 per person. The meaning is the same.

[Oden]

Thank you, Sue.

[susan53]

You've found my weak spot. I love teddies - I have a huge collection
So thank you