Kindly SOLVE AND EXPLAIN

A project manager is using the earned value reporting method to manage his project. Thefollowing table shows the data collected to date. The plan is for the project to be complete aftereight weeks. The earned value report shows data collected for the first four weeks of the project.
The figure shown in the table are cumulative.
Week       PV      AC      EV
1             1,000 1,000 1,000
2             3,000 2,000 2,500
3             5,000 5,000 6,000
4             7,000 9,000 7,000
5            13,000
6            17,000
7            19,000
8            20,000

85. What is the BAC for the project during week 4?
a. 7,000
b. 9,000
c. 5,000
d. 20,000

 86. During week 5 it is found that some of the work that was reported complete in week 2was considered unacceptable. It will require $500 to fix the problem and make this workacceptable. The work is scheduled to be done in week 6. No other work is reported to becomplete during week 5. What is the EV for week 5?
a. 7,000
b. 6,500
c. 9,000
d. 5,000