A woman needs to buy 16 oz of butter for a dessert recipe.  She can either buy a single 16 oz package of the store-brand butter for $7, or she can buy an 8oz package of store butter for $4 and use a coupon to get an additional two 4 oz packages that normally sell for $2.0 each at a 50% discount (which is applied to each 4oz package separately).  What is the lowest price she can pay for the 16 oz of butter she needs?
If she uses the coupon, she will pay 2*0.5 = $<<2*0.5=1>>1 for each 4oz package.
Thus, she will pay 4 + 2*1 = $<<4+2*1=6>>6 in total for the 8oz package and the two 4oz packages she needs to reach 16 oz of butter when using the coupon.
Therefore, the lowest amount she can pay is $6, as this is cheaper than the $7 price for a 16 oz package.
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