need help on this program in java language

Problem: Mobile Service Provider A mobile service provider has three different subscription packages for its customers: Package A: For $50 per month, 5 GB data are provided. Additional data is $15 per GB. Package B: For $65 per month, 10 data are provided. Additional data is $10 per GB. Package C: For $75 per month unlimited data provided. Text messaging and voice services are included in all of the company's data packages. The Mobile Service Company offers a roaming and long distance call services with additional costs. The roaming service will add $10 and the long distance call service will add $5 to the customer's monthly estimate. Design a MobileService Calculator to estimate the client's monthly payment. Write a program that calculates an estimate of the customer's monthly bill. It should ask which package the customer will purchased and their monthly data consumption. Include a 11.5% service tax and $7.54 charge from FCC (Federal Communications Commission). It should include Input Validations for plan selected by user and their monthly data consumption (GB) as part of the solution. The program should allow the user to do a new monthly estimate without exit the program. In addition, the program will display the customer savings with other plans selection. Finally, the program recommends the best plan for the customer based on the estimate of the monthly payment and computed savings if apply. Design your program using selections, loops and methods as part of the solution. What do I include as part of the solution? Algorithm (flowchart or pseudocode). JAVA source code (source.java)