Nina has some money saved for a vacation she has planned.

The vacation will cost a total of $1600.
She will put $150 every week into her account to help pay for the vacation.
She will have enough money for the vacation in 8 weeks.
If Nina was able to save $200 a week instead of $150 a week, how many fewer weeks would it take her to save enough money for the vacation? Enter the result in the response box.