conversations.from: human
conversations.value: Find a solution for this math problem: Linus works for a trading company. He buys a mobile device for $20 and sells it for twice the amount of the original price. If he bought 2 devices last Monday and 4 devices last Tuesday, how much profit was he able to earn after selling all the mobile devices he bought last Monday and Tuesday?
conversations.from: assistant
conversations.value: The total cost for the devices he bought on Monday is 2*20= 40
  The total cost for the devices he bought on Tuesday is 4*20 = 80
  The total cost of these devices is 80+40= 120
  Linus sold each mobile device he bought for $20 x 2 = $40.
  So, he earned $40 x 2 = $80 for the two devices he bought last Monday.
  And he earned $40 x 4 = $160 for the 4 devices he bought last Tuesday.
  The total amount of sales he made were worth 160+80 =240
  Linus earned 240-120 =$120