Yes, すごくカンタン利益計算 is completely free and it doesn't have any in-app purchases or subscriptions.
Not enough reviews to make a reliable assessment. The app needs more user feedback.
すごくカンタン利益計算 is free.
To get estimated revenue of すごくカンタン利益計算 app and other AppStore insights you can sign up to AppTail Mobile Analytics Platform.