During a four-week period, you worked the following hours: week 1- 363 /8 hr; week 2- 411 /4 hr; week 3- 401 /2 hr; week 4- 383 /8 hr what is the average number of hours you worked in one week?
a. 393 /8 hr
b. 381 /4 hr
c. 391 /8 hr
d. 383 /4 hr

Total hours worked in 4 weeks = (363/8) + (411/4) + (401/2) + (383/8)
                                                 = (363 + 822 + 1604 + 383)/8
                                                 = 3172/8 hours
                                                 = 793/2
Then
Average hours worked in a 4 weeks = (793/2) hours
So
Average hours worked in 1 week = 793/(2 * 4) hours
                                                     = 793/8 hours
So the average number of hours worked in 1 week is 793/8 hours.                                                     

The discount is 8.70 . you dont tell us the percent of tax added so there is no way to find out, unless i'm not seeing anything. without tax its 37.70