First of all, at least 50 yuan. That is to say, if you want to use it, you must ensure that there is at least 50 yuan in it. \ x0d \ x0d \ Secondly, you said 15, 25 yuan, etc. On the basis of charging 50 yuan, it can be recharged in multiples of 5. For example, you may not have enough 50 yuan this month, so you can charge 50+5=55 yuan. \x0d\\x0d\ Furthermore, if you think that 50 yuan can't be used for multiple purposes, you can apply for the e-wallet function, that is, the bus fare is 9 1%, which is not a half-price function, so you can save some money, and you can always accumulate it, and it will not be cleared at the end of the month. \x0d\\x0d\ In addition, Card A is recommended to be recharged in the first quarter, totaling 150 yuan, so that it will be cleared at the end of each quarter instead of every month.