This question needs more information.
Every app varies in cost, from free, to $1, to $20 or more.
$50,000 to $150,000 would be how much an app like Practo costs.
FREE!!
free
Once you buy an app, you can use it as much as you want.
1 dollar
About one dollar each
depending on your app, some are free though
$99/yr for Itunes
It is free to update the app.
£17.95 from their website.
It's £2.99 on the App Store.