# 想要切换订阅，如何计费

你有2个订阅 订阅A 10天10块钱，则每天1块钱 

订阅B 5天15块钱，则每天3块钱

有四种场景 

1、张三现在是A订阅，还有6天到期，他想升级到B订阅，那么他的有效期是多少天？ 答案是 6\*(10/10)/(15/5)+5=7天

2、李四现在是A订阅，已经过期5天，升级到B订阅，那么他的有效期是多少天？ 答案是 5天

3、王五现在是B订阅，还有4天到期，他想降级到A订阅，那么他的有效期是多少天？ 答案是 4\*(15/5)/(10/10)+10=22天

4、赵六现在是A订阅，还有6天到期，继续A订阅，那么他的有效期是多少天？ 答案是 6+10=16天


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