conversations.from: human
conversations.value: Sally has realized she did not receive a full wage this week. Her bank account, which held $200 at the start of the week, now holds $420. She has received no other money into her bank account this week. If her weekly wage should be $300, how many dollars were withheld from Sally’s wage?
  Give me a detailed solution.
conversations.from: assistant
conversations.value: The wage she received was $420 – $200 = $220
  This means her wage was $300 – $220 = $80 short