conversations.from: human
conversations.value: This math problem has got me stumped: Catherine goes to the grocery store. She buys 1 kilo of apples for $4, 2 kilos of bananas for $2 per kilo, and 2 kilos of oranges for $3 per kilo. How many dollars does she pay in total?
  Can you show me the way?
conversations.from: assistant
conversations.value: 1 kilo of apples costs $4.
  2 kilos of bananas costs 2 * 2 = $4.
  2 kilos of oranges costs 2 * 3 = $6.
  She pays 4 + 4 + 6= $14 in total.