title: Data Manipulation - Basic
body: <p>I have this table I am working on. All I need to do is to sum the rows for countries, that is, I should have one row for Afghanistan that sums all the three rows, one row for Albania....
  Is there any way I can do it easily on R? I thought of using the group_by function but it ain't getting me anywhere. Your help is appreciated.</p>
  <p><img src="https://i.stack.imgur.com/f6ipL.png" alt="enter image description here" /></p>