Answer: a) $0.08 b) 0.09 c) grocery store
Step-by-step explanation:
Given: The selling price of 25-ounce container of lemonade mix at grocery store= $2.00
a) The unit price e for the lemonade mix at the grocery store 
⇒The unit price e for the lemonade mix at the grocery store 
b)The selling price of 75-ounce container of lemonade mix at wholesale club= $6.75
The unit price e for the lemonade mix at the wholesale club 
⇒The unit price e for the lemonade mix at the wholesale club 
c) Clearly, the selling price of lemonade mix is lower at the grocery store, therefore buying lemonade mix from grocery store would be a better option.