The answer is D. An increased interest rate. The bank will increase the interest rates on loans to get a return on their expences.
Answer:
i find de interst rate 10 %
Answer:
a) 
b) 
c) For this case we have the total sales $ 15 millions after t =4 months
d) 
e) This value represent the increase in the amount of sales in millions after t=4 months
Explanation:
For this case we have the following function for the sales

Part a
For this case we want to find the derivate of S respect to t and we got:

Part b
For this case we want to find the value of S when t = 4 so if we replace we got:

Part c
For this case we have the total sales $ 15 millions after t =4 months
Part d
For this case we just need to replace t=4 in the derivate and we got:

Part e
This value represent the increase in the amount of sales in millions after t=4 months
The answer to this question is Budget Deficit. Budget Deficit
shows that the government spending is exceeding the government revenue in a
year. In order to resolve the problem in budget deficit the government should
cut the expenditures or the government spending and find a way to increase
revenue of the country.