Solve, have seen faint in the toilet

Ms. Wang thinks that she has paid 100 yuan to her neighbor, but it is not right. Because Miss Wang had "cheated" the neighbor of 100 yuan with the fake "One Bai Yuan", and the neighbor did not lose anything in the end, so the shopkeeper and the neighbor had nothing to do with it, that is to say, the account was flat. It was true that Ms. Wang had given the customer the first $40 and a pair of shoes, but since the purchase price (i.e. cost) of a pair of shoes was $90, the shopkeeper lost a total of $130.

The customer took $40 and a pair of shoes worth $90, and if the customer succeeded, he would be able to defraud him of a total of $130.

I hope I can help you with your doubts.

100 + 45 + 70 = 215 This 30 is a front and you just have to calculate how much money she loses hope.

The neighbor's 100 change is true, find the customer 40 and 60, the cost of shoes two pairs of 90 I have to pay the neighbor 100 in the end, and I find the remaining 60 plus my own pad 40 to the neighbor! The cost of 40+ shoes of the self-pad is 90, so it is 130

230 right.

100 + 45 + 45 + 40 230.