Contribute video: Introducing percentages 2

  ______     ___      _  _      ___    
 /_   _//   / _ \\   | \| ||   / _ \\  
 `-| |,-   | / \ ||  |  ' ||  / //\ \\ 
   | ||    | \_/ ||  | .  || |  ___  ||
   |_||     \___//   |_|\_|| |_||  |_||
   `-`'     `---`    `-` -`  `-`   `-`