Delores has some money. She buys a computer for $400 and a printer for $40. If she has $10 left, how much money, in dollars, did Delores have at first?
The computer and printer cost 400+40=<T>add(400, 40)=440 dollars.
Delores had 440+10=<T>add(440, 10)=450 dollars at first.
