Why do I have 40 cents in my transportation card? How to deduct money from Shanghai subway?

If you don't take a taxi with this traffic card, the reason for 4 cents is. Give you a reason to discount! Subway: From 1 day every month, 70 yuan can enjoy a 10% discount when he arrives at the account in that month. Next month, start from 1 and recalculate. Transfer from subway to bus: you can enjoy preferential transfer within 2 hours, that is, the bus fee is deducted 1 yuan. Bus to subway: you can enjoy preferential transfer within 2 hours, that is, subway deduction 1 yuan. (Only recently discovered) In addition, after the subway is full of 70 yuan, you can enjoy a discount of 1 yuan when you transfer to the bus subway, and you can still enjoy a 10% discount after deducting the balance. For example, if you take a bus to 2 yuan, you will change the subway mileage fee to 4 yuan, and the actual exit will be calculated according to 2.7 yuan (4-1= 3; 3*0.9=2.7), the total number of buses and subways is 4.7 yuan.