A charity organization had a fundraiser where each ticket was sold for a fixed price. They had to sell a few tickets just to cover necessary production costs of $\$1200$. After selling $200$ tickets, they had a net *profit* of $\$12{,}000$. Let $P(n)$ denote the net profit from the fundraiser $P$ (measured in dollars) as a function of the number of tickets sold $n$. **Write the function's formula.** $P(n)=$ [[☃ expression 1]]