Answer) $92 A night Explanation) First you would add $50 to the initial $410 making the total for all 5 nights without the coupon $460. You would then divide $460 by 5 since he stayed for 5 nights getting your answer of $92 a night.
First, you need to divide the expense between the 5 nights. So 410/5=82. This is still with the coupon though. You need to add 10. When you do, you get $92/night. So, for five nights without the coupon, he would have spent $460 for the entire trip. Hope this Helps!