The manager at a local convenience store needs one cashier to work. She employs 2 people one full time and one part-time to mind the store when she can't be there but only one of them needs to be there. The full-time employee is reliable 95% of the time and rarely calls in sick. When he does miss work, the manager can call upon the part-time employee to fill his place and she is reliable 80% of the time since she works other part time jobs. Determine the likelihood that the store manager will have to mind the store and work as a cashier (i.e. the likelihood that both employees cannot work).

Select one:

a.99.6

b.0.996

c.0.004

d.99%

e.1%