conversations.from: human
conversations.value: I need help with this problem:
  90 single use contacts come in 1 box and will last Pete 45 days.  Each box is $100.00 and currently 10% off.  If he buys 2 boxes of contact, how much will each pair of contacts cost?
conversations.from: assistant
conversations.value: Each box of contacts is $100.00 with 10% off so that's 100*.10 = $10.00 off
  So the box was $100.00 and he has $10.00 off so each box will cost 100-10 = $90.00
  He buys 2 boxes and each box costs $90.00 so that's 2*90= $180.00
  1 box of contacts has 90 contacts and he buys 2 boxes so that's 90*2 = 180 contacts
  He needs 1 contact for each eye and he has 180 contacts so that's 180/2 = 90 pairs of contacts
  He spent $180.00 to have 90 pairs of contacts so each pair of contacts costs 180/90 = $2.00 a pair