Make a Programmable Scientific Calculator that can store daya

I want a professional who can design me a calculator that can do few new things in the design and look of Ordinary Casio Fx-991 ES calculator http://www.amazon.com/Casio-Plus-Scientific-Calculations-Calculator/dp/B0089QEFW6/ref=sr_1_2?ie=UTF8&qid=1424270763&sr=8-2&keywords=FX+991+ES+calculator I want the new calculator to have a storing facility I also want the calculator to accept the data from the USB and that can store that data Hopefully it can also be programmable We also have additional features if you can handle that The calculator circuit can be stored in the design of the calculator I link shared above I welcome questions and suggestions There are already storing facility in the Texas calculator but they are not allowed in the exams here.