How to make app like this

Discuss
#1

https://play.google.com/store/apps/details?id=com.mdm.calculator
Plz help how to make app like this

#2

Can you explain what does that app do ??

#3

This app was updated today with zero installs. Why do you want to make a copy of that.

#4

As I say you can make it with help of spreadsheet
1st you need to design you app same or different from this one
Then you need to call updated rates from spreadsheet.
Then set block when btn click no. Of student multiply by rates which you set in spreadsheet
At the last you need to add all no. Then you got final result.

1 more thing rates set according to average meal.

#5