The reason I wanted to make this short tutorial is because there are a lot of old tutorial available on Internet to help you make a powerpoint using R. But some time back RStudio made this new option available that makes it extremely easy and simple to make a Powerpoint Presentation with R outputs in it.
Check it yourself
+ By going to File -> New File -> R Markdown
+ Then, Presentation -> Powerpoint
Please make sure you have got Microsoft Powerpoint or Open Office installed.