question: John buys milk for 2 dollars, eggs for 3 dollars, light bulbs for 3 dollars, cups for 3 dollars, and roach traps for 4 dollars.  If there is a 10% tax on all nonfood items how much did everything cost.
answer: The foodstuff cost 2+3=$<<2+3=5>>5
  The nonfood stuff comes out to 3+3+4=$<<3+3+4=10>>10
  Tax on the nonfood stuff comes out to 10*.1=$<<10*.1=1>>1
  So the total cost is 5+10+1=$<<5+10+1=16>>16
  #### 16