question: A pencil cost $0.50, and an eraser cost $0.25. If you bought 6 pencils and 8 erasers and paid $10, how much change would you get?
answer: 6 pencils cost 6 x $0.50 = $<<6*0.5=3>>3.
  8 erasers cost 8 x $0.25 = $<<8*0.25=2>>2.
  Thus, you spent $3 + $2 = $<<3+2=5>>5.
  Therefore, you would get $10 - $5 = $<<10-5=5>>5 change.
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