Print Cost Estimator app for android

I made this Android Application with MIT app Inventor software to help estimate my printing costs. It helps estimate how much money you're spending printing and how much you should charge when printing for others. I'm no great programmer, but it does the job.

To install the file on your android device just download the PrintCostEstimate.apk file then click install. You may have to go to settings and check the box to allow installs from unknown sources. This is because I'm not a professional