Taxi fare app

Create an application for taxi owner. This app will be used by passengers to pay the taxi fare . The minimum taxi fare acceptable is R20 from UMP to Mbombela CBD. The app only accepts bank notes( cash payment) yet so it will take the amount the customer is paying with deduct R20 and return change. If the passenger is paying for more than one client it will calculate the total and return the change accordingly.

we using android studio and we need to put layouts