Answer:
Explanation:
Base on the scenario been described in this question, we can use the following method to be solve the question below using Microsoft word we have the solution in the image attached file below
Answer:
The carpenter earned an extra $100.
Explanation:
Since this problem deals with a one-year loan with an yearly interest rate, it can be treated as a simple interest problem. For simple interests, the final value (Vf) can be found by multiplying the initial value (Vi) by one plus the interest rate (i) as shown below:

To find how much extra money the carpenter made in the first year, one should subtract the final value of loan from the $2,000 dollars down payment plus the extra $400 he collected for the year
.
Therefore, the carpenter earned an extra $100.
Answer: Option (A) is correct.
Explanation:
In a competitive market, when the demand curve i.e. the marginal benefit curve is exactly equal to the supply curve i.e. marginal cost curve and at this point the sum of consumer and producer surplus is maximized then an equilibrium is set in an economy and economic efficiency is obtained.
Inefficiency occurs at a point where there is a disequilibrium in an economy which means that competitive equilibrium is not achieved by the economy.
Answer: I think that ones the answer too