As DJ mentioned, it really depends upon the package you normally purchase.
Here's the approximate breakdown in packages in USD to the nearest thousands (done due to odd numbers and not an even split).
200 = $0.099/token
550 = $0.091/token
900 = $0.084/token
1875 = $0.080/token
So, if you only purchased the 200 token package, you would have spent about $5512 USD. If it was only the 550 package, about $5066 USD. I don't recall if at your point level if you are allowed to purchase at the 900 token package or not.
The best way to figure it is as such: (Points x 10) x ATP = Total in USD
ATP is the average token price based upon which token package(s) you normally purchased.
Unfortunately, there's no exact science to it. If you wanted to do an exact amount, you'd be best served to go back to your bank statements and pull the info from there.