Answer 4 a : P= 10-0.2D
PD= 10D -0.2D 2
TR = 10D - 0.2 D 2
First derivative of total Revenue is and maximum shows that
10- 0.4D = 0
0.4D= 10
D= 25 units
With the help of taking first derivative we know that the value of D is equal to 25 units maximum revenue earned by firm.
When D= 25 units
TR= 10D - 0.2D 2 = 10(25)- 0.2(25)2= 250-125= $125
When D= 30 units
TR = 10(30) - 0.2(30)2 = $120
This shows that by selling more you need the total revenue has been decreased. It means that d is equal to 25 shows the maximum Total revenue the company generated.
b : Total profit (π ) = TR -TC
Total profit ( π . ) = 10D -0.2D 2 -10+D -0.3D 2
Total profit = -0.5D2 +11D -10
Derivative of the total profit maximum it's
-D +11=0
D= 11units
Therefore total profit is maximum where they sold D=11units
Total profit= $51
When D = 20unit
Total profit = -$69
This shows that D = 11units maximum the profit of the firm.
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