請問我寫的四句英文句子文法有沒有錯

1)We should reduce the price of our milk drinks so that more people can afford to buy it. - correct
2)The carton package should be redesigned so as to attract more people to buy the product.
3)We should increase the number of (no the) promotion so that (no let) more people can know our new product faster.
4)Some free tasting should be provided so that our customer can try it. - correct

1)We should reduce the price of our milk drink so that more people can afford to buy it
We should reduce the price of our milk to let more people can afford to buy.
2)The carton package should be redesigned so as to attract more people to buy it
We should redesign the carton packing to attract more people.
3)We should increase the number of the promotion so that let more people know our new product soon
We should create more concerned promotion of our new products to public.
4)Some free tasting should be provided so that our customer can try it.
To offer free tasting for all potential customer.
Hope I can help you ^.^
圖片參考：http://tw.yimg.com/i/tw/ugc/rte/smiley_39.gif

1) We should reduce the price of the milk, so that people can afford buying it .

2) The carton package should be redesigned, in order to attract more customers.

3) We should fasten on our promotion, then people can quickly get more information about the new products.

4) Free tasting should be provided, so that our customers can have a try.

We should reduce the price of our milk, so that people can afford it .

2.The carton package should be redesigned, because they try to make people attention
OR
The carton package should be redesigned,attract more people attention

3.We should increase the phone number in the promotion, so that people will know more about our new product.

4. Some free tasting should be provided, so that our customer will know what is it taste like.