Refer to Problem 10.13.
a) If the allowance factor is 15%, what is the standard time for this operation?
b) If the allowance factor is 18% and the performance rating is now 90%, what is the standard time for this operation?

Data From Problem 10.13:

If Charlene Brewster has times of 8.4, 8.6, 8.3, 8.5, 8.7, and 8.5 and a performance rating of 110%, what is the normal time for this operation? Is she faster or slower than normal?