How do we find the total revenue of a given function p=10-2.5q
Think about this.
if you sell cans of baked beans for $1.50 per can then p=1.50 dollars
If you sell 8 cans then q=8
The total revenue for the baked beans is $1.50*8 = $12 = p*q
So TR=price*quantity = (10-2.5q)q = -2.5q2 + 10q