conversations.from: human
conversations.value: Provide a step by step solution for the following math problem: Christopher uses 1 packet of a sugar substitute in his coffee.  He has 2 coffees a day.  The packets come 30 to a box and cost $4.00 a box.  How much will it cost him to have enough sugar substitutes to last him 90 days?
conversations.from: assistant
conversations.value: He uses 1 packet per cup of coffee and he has 2 cups a day so that's 1*2 = 2 packets
  He wants enough to last him 90 days and he uses 2 packets a day so that's 90*2 = 180 packets
  The packets come 30 to a box and he needs 180 packets so that's 180/30 = 6 boxes of sugar substitute
  Each box costs $4.00 and he needs 6 boxes so that's 4*6 = $24.00