Always always always, you must assign labels to all information:
f=190 (since the problem is over one week, this is just a fixed number)
Don't just write "fee=190". This allows you to write equations so 1) your logic won't tangle in your head and 2) you can do algebra with everything.
You only have 3 quantities and you can categorize where they matter:
p and f cost you stuff
r gets you stuff
Nothing else happens.
So revenue must only be R=rn.
Cost must only be C=rp+f. (You don't subtract the fee from cost, because cost is already subtracting from you.)
Of course, they probably want to substitute the actual numbers, but you should always do the setup with variables first.