If I get 1000 robux a month and buy 880 twice a month, how many months would it take to get 17000?
You would need to save up 8,800 robux each month (880 x 2 = 1,760 robux spent each month) to reach 17,000 robux.
So, it would take 2 months to save up enough to reach 17,000 robux.
In the first month, you would save 8,800 robux, leaving you with 9,200 robux.
In the second month, you would save another 8,800 robux, which when added to your remaining 9,200 robux, equals 18,000 robux.