Given that the cost of cleaning 𝑥 windows is 10𝐶(𝑥) = 𝑥 + 250 and it is found that the demand for cleaning services is 𝑝 + 0.01𝑥 = 10. How much per service should be charged to maximize the profit?

I got 2 large x decimal points which i dont think is correct.. can anyone help with this question?

what is p? Is it the demand?

I can't make sense of this, but you know that
profit = revenue - cost
revenue = price * demand
So when you figure those out, just find where the derivative of
price * demand - cost = 0

and I sure can't figure out what you mean by "2 large x decimal points"