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