conversations.from: human
conversations.value: Find a solution for this math problem: James decides to pick some blueberries.  It cost $20 to go picking and then another $1.5 per pound.  He picked 30 pounds of blueberries.  How much did he save compared to buying at the store for $2.5 a pound?
conversations.from: assistant
conversations.value: He paid 30*1.5=$45 for the blueberries he picked
  So after the entrance fee it was 45+20=$65
  To buy them at the grocery store it would cost 30*2.5=$75
  So he saved 75-65=$10