1 more (E).

(1) states only the wage, but we know nothing of the number of hours worked

(2) states only the number of hours worked last week, but we don't know how much the employee is paid per hour

when taken both together, though it seems as we have all the necessary information, we still cannot determine exactly how many hours the employee worked on the more special day, which is Sunday (since he gets paid twice the wage). Given only 54 hours of work, the employee could have worked 6, 7, or 8 hours on Sunday, which will give him different salaries for that week.

To illustrate the above point, here's a crappy diagram:

Monday Tuesday Wednesday Thursday Friday Saturday Sunday Total Hours Total wage

8 8 8 8 8 8 6 54 $600 <--1 possibility

8 8 8 8 8 7 7 54 $610 <--1 possibility

8 8 8 8 8 6 8 54 $620 <--1 possiblity

Therefore, even with both statement together, the possibilities can still be $600, $610, or $620, (E) is the answer.

_________________

Get the best GMAT Prep Resources with GMAT Club Premium Membership