Also, let's round `transfer_volume` to the nearest $100. So $5,197.58 would round up to $5,200, and $5,149.50 would round down to $5,100.

![screen shot 2013-09-05 at 4 04 18 pm](https://f.cloud.github.com/assets/134455/1091322/624b2288-1666-11e3-9c34-6c6344192e0f.png)