Can any one make these numbers work? There's plenty of talk...

Can any one make these numbers work?

There's plenty of talk about the NBN but no basic numbers provided to back the argument up.

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Say 10 million Australian homes.

At 93% coverage.

Cost $42 billion.

Uptake rate a generous 50% = 4.65 million homes.

At $60 to $80 per month according to Swan - Average $70 (how much of that lost to service provider profits? 5%,10%,15%?)

Interest on $42 billion at 10 year bond rate 5.15%

Annual running costs of NBN system?