Assume that if the interest rate that businesses must pay to borrow funds were 20 percent, it would be unprofitable for businesses to invest in new machinery and equipment so that investment would be zero. But if the interest rate were 16 percent, businesses would find it profitable to invest $10 billion. If the interest rate were 12 percent, $20 billion would be invested. Assume that total investment continues to increase by $10 billion for each successive 4 percentage point decline in the interest rate.
-Refer to the above information. Using i and I to indicate the interest rate and investment (in billions of dollars) respectively, which of the following is the correct tabular presentation of the described relationship? 
Definitions:
Total Cost
The complete cost of producing a specific quantity of goods or services, including both fixed and variable costs.
Average Cost
This is the total cost of production divided by the number of goods produced, also known as the cost per unit.
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