conversations.from: human
conversations.value: I need help with this problem:
  A customer’s loyalty card at a store gives them rewards of $1 off their next purchase for every $20 they spend. Their last shopping trip, they spent $80. This shopping trip, they spent $43, used their rewards, and applied a coupon that took twice the amount of rewards off the price. How many dollars did the customer pay on this shopping trip?
conversations.from: assistant
conversations.value: The customer had 80 / 20 = $4 in rewards.
  Their coupon was worth 4 * 2 = $8.
  Thus, they paid 43 - 4 - 8 = $31 on this shopping trip.