Paul was going to buy $$4$$ servings of ice cream, but he was $$80$$ cents short. So, he bought $$3$$ servings and had $$30$$ cents left. What was the price of one serving of ice cream? 
Overseas Competition->Knowledge Point->Word Problem Modules->Distribution Problems->Basic Distribution Problems
$$(80+30)\div (4-3)=110$$ cents $$=1$$ dollar and $$10$$ cents. 