James earns $20 an hour while working at his main job.  He earns 20% less while working his second job.  He works 30 hours at his main job and half that much at his second job.  How much does he earn per week?
James earns 20*.2=$<<20*.2=4>>4 less while working his second job
So he earns 20-4=$<<20-4=16>>16 an hour
At his first job he earns 20*30=$<<20*30=600>>600
He works 30/2=<<30/2=15>>15 hours at his second job
So he earns 15*16=$<<15*16=240>>240
So he earns 600+240=$<<600+240=840>>840 a week
#### 840