thirteen dollars seventy two 为什么是50dollars?

首先,听力原文是这样的
Man:Good morning,I’d like to send this package to India.
　　Woman:I’ll need you to fill in a custom’s form,please.
　　Man:Sure.Contents in detail,erm… sweater,value,erm… 50 dollars.weight?Oh,I don’t know the weight.
　　Woman:Put it on the scale.
　　Man:There you go.
　　Woman:Ok,that’s one pound and a half.
　　Man:Really?How much is that in kilograms?
　　Woman:Oh,over half a kilo.Now,is it in ordinary mail or air mail?
　　Man:Ordinary mail,please.
　　Woman:That’s going to thirteen dollars seventy two.
　　Man:Thank you.
注意问的是
value 包裹价值 所以根据原文第三行,应该是50 dollars.而最后一句说的是邮费.
希望我的回答能帮到你,如有任何疑问,请与我沟通.那么邮费是$13.72吗?对！