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?
The total cost for the devices he bought on Monday is 2*20= <<2*20=40>>40
The total cost for the devices he bought on Tuesday is 4*20 = <<4*20=80>>80
The total cost of these devices is 80+40= <<80+40=120>>120
Linus sold each mobile device he bought for $20 x 2 = $<<20*2=40>>40.
So, he earned $40 x 2 = $<<40*2=80>>80 for the two devices he bought last Monday.
And he earned $40 x 4 = $<<40*4=160>>160 for the 4 devices he bought last Tuesday.
The total amount of sales he made were worth 160+80 =<<160+80=240>>240
Linus earned 240-120 =$<<240-120=120>>120
#### 120