Donna can finish a total of 8 x 5 = 40 episodes during the weekdays. Meanwhile, she can finish 8 x 3 = 24 episodes each day during the weekend. The total number of episodes she can watch every weekend is 24 x 2 = 48. Therefore, Donna can watch 40 + 48 = 88 episodes every week.
This justifies what answer for what question? Q & A:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
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Donna can watch 8 episodes each day during weekdays. On each weekend day, she can watch three times the number of episodes she can watch on the weekdays. How many episodes can she watch in a week?
88