00:01
Which has its marginal cost function as 3 times q squared plus 4 and it has its price and quantity function linked as price plus quantity is equals 220 so it wants us to find the total revenue and profit function for us so for the total revenue we are aware of the fact that total revenue tr is equals to price multiplied by quantity.
00:36
So when we reshape this equation, the first one that we have, we get that price is equal to 20 minus q.
00:46
We'll do this since it has asked us to form the equation in q.
00:51
So we get that 20 minus q multiplied by q is our total revenue function.
01:00
So we get tr is equal to 20 q minus q squared.
01:06
So for that we have our tr function.
01:10
And so we want to find the function for cost before we find the function for profit since profit is equal to total revenue minus total cost.
01:21
So for revenue, so for cost, we are aware of the fact that marginal cost is the derivation of cost.
01:30
So if we integrate mc, we will get cost.
01:35
So integral of mc is equals to c.
01:40
So we will integrate this function that we have with us.
01:43
We will integrate 3 q squared plus 4.
01:47
We will put an integral sign here.
01:50
We'll put an integral sign on mc...