Answer:
The simplified expression is S = (t^2 - 6t + 6) / (t^2 + 3t - 4).
None of the provided equations matches this form.
Step-by-step explanation:
Let's look at the provided options:
a. S = (5t - 4) / (t + 1)
b. S = (4t + 4) / (t - 1)
c. S = (t - 4) / (t + 5)
d. S = (t + 4) / (t - 4)
None of these options matches the simplified form of the average sales each day. The correct expression is S = (t^2 - 6t + 6) / (t^2 + 3t - 4), which is not represented in the provided choices.