Walkabout wrote:

An employee is paid 1.5 times the regular hourly rate for each hour worked in excess of 40 hours per week, excluding Sunday, and 2 times the regular hourly rate for each hour worked on Sunday. How much was the employee paid last week?

(1) The employee's regular hourly rate is $10.

(2) Last week the employee worked a total of 54 hours but did not work more than 8 hours on any day.

We are given a complicated equation (IF I understood it correctly):

We are given: 40*x + 1.5*(y - 40) + 2x*Z = Salary last week

Where x is his regular hourly rate, y is total time worked and z is hours worked on sunday.

1) Solves for x, we still have 3 unknowns (y, z, salary)

2) gives us y, and gives us a weak restriction for z, but this is clearly not sufficient

1 + 2: We now have x and y, and just a vague restriction for z (z < 8), and given that he worked 54 hours in total, and an hour can be divided into fractions of an hour, we have different possibilities for z. And thus, we cannot solve for total salary.

So we go with E.