Alright, so let's start this problem:Let us first calculuate how much they must pay on Tuesday night. There are four people and they each must pay $21 to go to the show on a Tuesday night.We can calculate the total cost by doing $21 x 4 which is $84. Therefore they will spend $84 on Tuesday.Let us now calculate how much they will spend on Friday:It costs $35 for each peron on a Friday and since therer are four of them the total can be calculated by doing $35 x 4 which is $140. Therefore they will spend a total of $140 if they go on Friday.The question asks how much they will save, well that is the difference between the price on Tuesday and Friday:$140  $85 = $56Therefore they will save $56 if they go on Saturday.Hope I helped
