Please i need a answer for this math

A. Find the average grade of the following:

1.) 88, 84, 86, 83
2.) 80, 72, 70, 73

B. Compute for the target grade.

1.) Find the target grade in fourth grading to get an average grade of 75 if the student's grades in the three quarters are 75, 70 and 72.

2.) Find the target grade in fourth grading to get an average grade of 85 if the student's grades in the three quarters are 85, 83 and 82.