How to get paid android app in free of cost

Choose any games or application which you want to install. Then there is a particular format for the android apps, i.e called APK format. Any android applications and games are on .apk format. For example if you want to install Virtual tennis. First you search in google.com Search Virtual Tennis.apk download. then you will get a option of many file sharing sites. For example 4shared.com,2shared.com,apkmania etc. We can go to anyof them for the downloading. For virtual Tennis we have two files. One Virtual Tennis.apk and Datat file. First we have to download virtualtennis.apk which is around 24 MB.And later we have to download data file. After the download, install the game. If the game is installed from memory card. We have to set the permission first. For that we have to go to developers option and click mark on unknown sources. After t he installitation of apk file. We have to go to sDcard/Android and ,make a file named OBB. Inside sDcard/Android/obb (Copy and paste Datafile of vritual Tennis and get ready to play the game. For the application which we dont need data files. We can just inatall the apk and install files.