There is a telegram conversation going on about this scam at https://web.telegram.org/#/im?p=g247000900

I developed this app late last year because I needed the functionality for myself & couldn't find any calculators that did it. I never got around to posting it to Bitcointalk but now that I've passed 500 downloads it seems like an appropriate time.

From the play store description:

As a local & online trader myself I wanted the ability to calculate the amount of a bitcoin purchase or sale based on a specified markup or markdown over the current bitcoin price so I built this app with traders in mind. With the popularity of Localbitcoins.com, regional bitcoin meetups & other local trading activity this app is intended to provide a simple utility for calculating the cost of any given trade.
The app now supports USD, EUR, CNY, GBP, AUD & JPY as well as multiple exchanges.

Google does not allow you to set your markup fee as a seller & calculate based on that.

I just pushed out an update to my app for bitcoin traders. The app allows bitcoin resellers to input their markup percentage & calculate USD to BTC & BTC to USD. The app can now use prices from multiple exchanges as well as EUR/BTC & BTC/EUR. Thanks guys for all your support! Play store link:
https://play.google.com/store/apps/details?id=appinventor.ai_dhodges1122.Bitcoin_Trade_Calculator_checkpoint15

WestSideBitcoins.Com