Price for 20 feet of installed soffits & attic fan

I got a bid for a thermostatic controlled power vent for the roof installed for $300 and adding 20 feet of soffit for an extra $285. Not knowing much about each .... does this seem fair?
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Don wrote:

If that includes parts, then it sounds very fair.
--
Grandpa

What is that dripping from my fingers?
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