A-1 Chemical Supply pays Barbara Stewart a $1730 monthly salary plus a 3% commission on merchandise she sells each month. Assume Barbara's sales were $28,900 for last month.
Calculate the following amounts:
1. Amount of Commission:

2. Gross Pay:

Assume that there is a 11% rate of disk drive failure in a year. a. if all your computer data is stored on a hard disk drive with a copy stored on a second hard disk drive, what is the probability that during a year, you can avoid catastrophe with at least one working drive? b. if copies of all your computer data are stored on four independent hard disk drives, what is the probability that during a year, you can avoid catastrophe with at least one working drive?