public LtrGrade(Double numGrade) { // gets a letter from percentage
		if(numGrade == 0) {
			actualLetter = "";
			gradePronoun = "";
		}else {
			if (numGrade >= .90) {
				actualLetter = "A";
				gradePronoun = "an";
			} else if (.8 <= numGrade && numGrade < .9) {
				actualLetter = "B";
				gradePronoun = "a";
			} else if (.7 <= numGrade && numGrade < .8) {
				actualLetter = "C";
				gradePronoun = "a";
			} else if (.6 <= numGrade && numGrade < .7) {
				actualLetter = "D";
				gradePronoun = "a";
			} else {
				actualLetter = "F";
				gradePronoun = "an";
			}
		}	
	}