Sparrow works the following hours during a one-week period:
Day Hours Minutes
Monday 7 42
Tuesday 8 6
Wednesday 7 37
Thursday 7 58
Friday 8 47

Under the hundredth-hour method, how many hours has Sparrow worked?
a. 40.00 hours
b. 40.17 hours
c. 40.63 hours
d. 41.07 hours