question: Errol bought a computer, 2 monitors, and a printer for $2,400. He paid $400 less for the printer than the computer. If the computer cost $1,100, how much did one monitor cost, in dollars?
answer: He paid 1100-400=<<1100-400=700>>700 for the printer.
  He paid 2400-1100-700=<<2400-1100-700=600>>600 dollars for the monitors.
  Each monitor costs 600/2=<<600/2=300>>300 dollars.
  #### 300