Finding Revenue on a real world problem!

Question

Tickets for a Concert are cheaper when purchased in quantity. The first 100 tickets are priced at 10$ each but each additional block of 100 tickets decreases the cost of each ticket by 0.50$. How many blocks of tickets should be sold to maximize revenue?

Answer 1

x represents each increase of 100 tickets

R(x) = (100 + x)($10 - 0.15x)