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?
Stream of thoughts:
450
The computer and printer cost 400 + 40 = 440 dollars.

Delores had 440 + 10 = 450 dollars at first.

.

Final answer: 450