I talked with a technical support rep and found a solution.
Change the following variables:
${InBps} to ${InBps as bandwidth}
${OutBps} to ${OutBps as bandwidth}
In summary, the message looks like this:
ALERT: Transmit Percent Utilization of ${FullName} is ${OutPercentUtil} %.
Current traffic load of this interface is
Received : ${Inbps as Bandwidth}
Transmitted : ${Outbps as Bandwidth}
So now instead of getting a "Receive" or "Transmitted" result in scientific notation such as "979446E+07", you should get "18 M".
Hope this helps.