How Much Can I Expect To Pay For Roof Replacement?

@laura-3478 had a question on pricing for replacing a roof.

Question:

Hi,
Hard to get proper info, but I'm looking for guidance on a full roof replacement. My home is about 200sqm in size and presently has concrete/cement roof tiles. It was built in 1980. After the crazy weather, we had a roofer come and do a minor repair to the roof, but he is now saying that the roof has had it and a full roof replacement is required. It is very expensive and it's very difficult to gauge what is a reasonable cost.
So far, I have had;
2 quotes to replace existing roof with colorbond – one quote was $50K the other quote was $60K.
1 quote to replace existing roof with cement tiles – $78K.
1 quote to replace existing roof with terracotta tiles – $97K.
$50K for the absolute cheapest seems like a lot, but maybe I'm wrong and my expectations need adjusting.  https://restonroof.com/oakton-va.php
My home is in he Northern Rivers region of NSW.
Thanks in advance.