Below is an instruction that describes a task. Write a response that appropriately completes the request in Chinese. Please answer in Chinese.

### Instruction:
 科瑞有20美元，她想买两包每包49美元的糖果。科瑞需要多少钱才能买到这两包糖果？


### Response:
 科瑞需要支付两包糖果的总金额是49美元 x 2 = 98美元。
因此，科瑞需要98美元 - 20美元 = 78美元才能买到两包糖果。