Marginal profit, and maximizing profit & average profit

Given the following information, find the marginal profit and the value of $q$ which maximizes the profit. Lastly, calculate the maximum profit.

1. $R(q) = -2q^{2} + 50q + 6, C(q) = 200 + 10q$
2. $R(q) = -\frac{10}{q^{2}} + 10, C(q) = 2q$
3. $p(q) = -2q + 400$, fixed cost is $$200$, costs $40$$ per unit to make
4. $q(p) = \frac{(300 - p)}{3}$, fixed cost is $$100$, variable cost is $$2q^{2}$

Given the following information, find the marginal average profit and the value of $q$ which maximizes the average profit:

1. $R(q) = -q^{2} + 35q, C(q) = 100 + 5q$
2. $R(q) = -\frac{100}{q} + 400, C(q) = 5q$
3. $p(q) = -2q + 50$, fixed cost is $$50$, costs $$10$ per unit to make
4. $q(p) = \frac{400 - p}{2}$, fixed cost is $$288$, variable cost is $$20q$