Need A math solver app made

Hello I'm looking for someone to design an application that allows the user to put in any math problem and application must be able to solve it and show the user how it was solved Requirements: Must be written in Java Must be for Android devices Must be able to get periodic updates with video video evidence or snapshots No milestone payment will be made up front the first milestone payment will be paid when we see evidence of a semi working product We are not very picky on the design who have a design team focus on the user interface and making it look pretty If you have any questions comments or concerns feel free to reply Hope to hear from you soon