code: function getBackgroundPositionInPercent(image) {
  	var x = 100 * (image.coordinates.x) / (image.properties.width - image.coordinates.width);
  	var y = 100 * (image.coordinates.y) / (image.properties.height - image.coordinates.height);
  	var template = _.template('<%= (x ? x + "%" : x) %> <%= (y ? y + "%" : y) %>');
  	return template({x: x, y: y});
  }
docs: Return the pencentage value for background-position property