Two analytical methods:

The first method:

Neighboring store: It is equivalent to borrowing 100 change from the neighboring store, and then returning 100 (it is conceivable that the neighboring store returned the fake money to Miss Wang), and the account is flat.

Customer: Miss Wang will pay as much as the customer takes, that is, shoes 45*2=90 yuan, change 100-30*2=40 yuan, one * * 130 yuan.

The second method: the money coming in and out through Miss Wang's hand is counted separately, so it is:

Expenditure: 1) two pairs of shoes: 45*2=90, 2) change for customers: 100-30 * 2 = 40 yuan, 3) return to the neighboring store: 100 yuan, totaling 230 yuan;

Income: 1) 100 yuan counterfeit money =0 yuan, 2) 100 yuan change from neighbors. Total 100 yuan.

Then the total loss: 230- 100= 130 yuan.