Answer:
Ans. c) The annual percentage rate of the loan is approximately 913%
Explanation:
Hi, well, she borrowed $75 and paid $90 ($75 + $15 fee) in 8 days. So we need to use the following formula to check what 8 days percentage rate was applied to this loan.

That is:

So she pays 20% for 8 days, to know the annual rate (approx.) we need to do the following operation.

That is 913% per year.
Best of luck.
Answer:
9.04
Explanation:
TIE ratio = profit excluding interest/interest
expense
Putting value in above equation;
TIE ratio = 68400-42900-6500/2100
TIE ratio = 9.04
Answer: As the firm produces more of a good, the cost of producing each additional unit increases this implies that the marginal cost of producing a good increases as it makes more of that good.
Explanation: Marginal cost of a producer refers to the addition in total cost when one more unit of a good is produced.
It is given by 
Refers to the following situations,
MC increases when adding output increases TC or Total Cost
MC decreases when adding output decreases TC
MC remains constant when adding output does not change TC
The supply curve of the firm is an upward sloping curve, which shows that quantity increases as price increases.
So, in relation to this, it means that MC will also increase as quantity increases.