Edit in JSFiddle

var percent = 33;
var answer;

function range1(percent) {
	console.log('Evaluate 1');
	return (percent > 66.66 && percent <= 100);
}

function range2(percent) {
	console.log('Evaluate 2');
	return (percent > 33.33 && percent <= 66.66);
}

function range3(percent) {
	console.log('Evaluate 3');
	return (percent > 0 && percent <= 33.33);
}

switch (true){
  case (range1(percent)): 
  	console.log('Match 1');
    answer = 'Answer 1';
    break;    
  case (range2(percent)): 
  	console.log('Match 2');
    answer = 'Answer 2';
    break;   
  case (range3(percent)): 
  	console.log('Match 3');
    answer = 'Answer 3';
    break;   
  default: // No class for that column count
    break;    
}

console.log(answer)