Help!! If you can.

I need the designer and blocks with procedure in app inventor only for this assignment below:

Joe's Automotive performs the following routine maintenance services:

oil change-$25.00

lube job- $20.00

Radiator flush-$30.00

Joe also performs other non-routine services and charges for parts and labor($30 per hour). Create an app that displays the total for a customer's visit to Joe's.