Many people have already started using multiple Android Devices, like a phone and a Nexus 7 tablet. If you have bought the Android applications on the phone, you might not repurchase copies of them on the tablet. Here is the tutorial on how to install paid Applications on Nexus 7.
* First setup the Google Account credentials in tablet. You will have to go to the Settings, and tap on "Accounts" and then choose "Add account". Tap "Google" to set up your Google Account that's used to purchase apps there.
* Once your account have been added, open the Google Play store app. Tap on the Menu 》 Accounts, and choose the appropriate Google Account.
* Tap on the Menu, go to "My Apps" section. You will see all purchased applications. If the app shows "Not Installed", tap it to transfer to your Nexus 7.