A pizza maker determined an annual profit in dollars from selling pizzas using `f\left(n\right)=65n-0.04n^{2}`where `n` is the number of pizzas sold. What is the annual profit if the pizza maker sells 300 pizzas?

To find the annual profit when selling 300 pizzas, we substitute `n = 300` into the profit function `f(n)`:

`f(300) = 65(300) - 0.04(300)^2`
`f(300) = 65(300) - 0.04(90000)`
`f(300) = 19500 - 3600`
`f(300) = 15900`

Therefore, the annual profit when selling 300 pizzas is $15,900.