The fast food restaurant recently launched two sets of packages, A and B. The set meal of A is 18 yuan each, and the set meal of B is 21 yuan each. Xiaofang has 60 yuan and wants to buy 3 copies. How many ways can she buy? Please write down two purchase options.
快餐店最近促销推出A、B两种套餐，A种套餐每份18元，B种套餐每份21元．小芳有60元，想买3份，有几种买法？请写出两种购买方案．
<result>3</result>