methods unit 2 question

[Maz]

the organisers of a raffle are trying to decide the price they should charge for tickets. From past experience they feel confident that they can sell 7500 tickets if they charge $1 per ticket. For  each 10 cent rise in the price they estimate that they will sell 250 tickets less.
they need to raise $5000 to cover the cost of prizes and printing
if they set the price per ticket at $(1+0.1x) i.e., $1 plus x lots of 10 cents, find
a) an expression in terms of x for the profit the raffle will raise?

I can do the rest but my expression isn't comeing out right...
thanks in advance

[popsicles]

Profit = (1+0.1X)(7500-250X)-5000
Number of people they can sell to on the left, and price of raffle on the left.
Also the minus is because profit = total revenue (left) minus costs (right).