Read the excerpt from it's our world, too! : young people who are making a difference. the author’s purpose in this excerpt is to

Can someone me with this english question

  which statement describes the main argument of truth’s speech

At a restaurant,one small drink costs $1.15 and one large drink costs $1.75 a family buys three small drinks and two large drinks.before tax,what is the total cost for the drinks at this restaurant