question: James gets a job selling used cars.  He sold 10 cars that cost $25,000 each.  The company paid 30% of that price to acquire the cars.  He got a 10% commission on the profits.  How much did he make?
answer: He sold the car for 25000*10=$<<25000*10=250000>>250,000
  Each car was bought for 25,000*.3=$<<25000*.3=7500>>7500
  So they bought the cars for 7500*10=$<<7500*10=75000>>75,000
  That means the cars had a profit of 250,000-75,000=$<<250000-75000=175000>>175,000
  So his commission was 175,000*.1=$<<175000*.1=17500>>17,500
  #### 17500