John assembles computers and sells prebuilt computers as a business. The parts for the computer cost $800.  He sells the computers for 1.4 times the value of the components.  He manages to build 60 computers a month.  He has to pay $5000 a month in rent and another $3000 in non-rent extra expenses a month.  How much profit does he make a month?
He sells each computer for 1.4*800=$<<1.4*800=1120>>1120
That means he makes a profit of 1120-800=$<<1120-800=320>>320 per computer
So he makes 320*60=$<<320*60=19200>>19200 from selling computers
He has extra expenses of 5000+3000=$<<5000+3000=8000>>8000 a month
So his profit is 19200-8000=$<<19200-8000=11200>>11,200
#### 11200