There are 8 hours and 15 minutes in her work day. If you take off one of those hours, it would be 7 hours and 15 minutes. If she is getting paid by the hour, you can take off the 15 minutes since it doesn't matter. Then, you divide her income ($64.38) by her hours (7). From this, you get about $9 (or if you wanna be specific, $9.20) per hour.
