Hi Pauline,
You'll get a better idea of cost to fix if you take the tablet to a technician. He/ she should give you a quote before starting work.
I don't know where you live so I can't recommend a particular repairer.
However, if you search online for "tablet computerrepair" you'll get a whole raft of hits and you can please yourself. Here are a few useful sites:
http://pcworld.co.uk/
http://gumtree.com/
iFixit The free repair manual iFixit
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