Am I calculating the Marginal Revenue when you get the quantity for the price of $6,000.00? I get zero?

Is this right?

Quantity=Q
Price=P
Total Revenue-TR
Fixed Cost=FC
Margin Cost-MC
Marginal Renenue=MR

___P_____Q______TR________MC____MR
$8,000|5,000|40,000,000|$1,000|$8,000
$7,000|6,000|42,000,000|$1,000|$2,000
$6,000|7,000|42,000,000|$1,000|0
$5,000|8,000|40,000,000|$1,000|$2,000

I believe you are mostly right. I don't see where the first MR value of $8000 comes from. (the first MR value should be undeterminable.) The change (MR) in TR from going from 5000Q to 6000Q is 2000, (correct in your table). The MR going from 6000Q to 7000Q is 0 (also correct in your table). The MR going from 7000 to 8000 is -2000 (wrong sign in your MR column).

To calculate the marginal revenue when the quantity is 7,000 and the price is $6,000, you need to determine the change in total revenue (TR) when the quantity increases by one unit.

In this case, as you move from a quantity of 6,000 to 7,000, the total revenue remains the same at $42,000,000. This indicates that there is no change in total revenue when the quantity increases by one unit.

Therefore, the marginal revenue in this scenario would be zero. It means that when the quantity is increased from 6,000 to 7,000, there is no additional revenue generated.