Do you have a talent for business?

Miss Wang is selling shoes, a pair of shoes purchase price of 45 yuan, the sale of 30 yuan, the customer to buy two pairs of shoes to a 100 yuan, Miss Wang no change, so find a neighbour shop for 100 yuan. (After the next shop found money is false, Miss Wang also lost the next shop 100 yuan)

How many Yuan did miss Wang lose altogether? (This problem is not simple, how much loss?) This set of questions have been tested in various groups, 100 people of the group, only 1 people in half an hour correct. ）

Problem Solving Ideas:

The total amount of money is certain, not much will not be less. In other words, the money that others make is the money you lose. So, the principle of balance of payments, the analysis of the income and expenses of 3 people can easily solve the problem.

Answer: 130

Do you have a talent for business?