conversations.from: human
conversations.value: Explain how to solve this math problem: Roger goes to the store to buy some coffee.  The normal brand of coffee he buys cost $5 per pound.  He had to buy a more expensive brand that cost 20% more since his favorite brand was sold out.  He decides to buy a week's worth of coffee and he uses 1 pound of coffee per day.  He also decided to buy himself a donut for $2.  How much did everything cost?
conversations.from: assistant
conversations.value: The coffee he bought was 5*.2=$1 more expensive per pound than what he normally buys
  So it cost 5+1=$6 per pound
  He goes through 1*7=7 pounds of coffee a week
  So he paid 6*7=$42 on coffee
  That means his total bill was 42+2=$44