conversations.from: human
conversations.value: Please show me the solution for: An archer needs to practice.  He intends to shoot 200 shots 4 days a week.  He is able to recover 20% of his arrows.  The arrows he uses cost $5.5 per arrow.  His team agrees to pay for 70% of the cost of his arrows.  How much does he spend for arrows a week?
conversations.from: assistant
conversations.value: He shoots 200*4=800 shots per week
  He can recover 800*.2=160 of those arrows
  So he uses 800-160=640 arrows a week
  The cost for those arrows would come out to 640*5.5=$3520 per week
  His team pays for 3520*.7=$2464 of that
  So he has to pay 3520-2464=$1056 per week for arrows