public class Gradebook {
	  public static void main(String[] args) {
		  double[][] grades = 
			  {{5, 15, 10, 5, 4, 8, 8.75, 8, 10, 10, 10, 10, 10, 10, 10},  
			  {70}, 
			  {249.9}, 
			  {140, 4}, 
			  {75, 90, 82.5}, 
			  {100}};
		
		sumAllGrades(grades);
		
		if (sumAllGrades(grades) >= 90) {
			System.out.println(sumAllGrades(grades) + " - A");
		} else if (sumAllGrades(grades) >= 80) {
			System.out.println(sumAllGrades(grades) + " - B");
		} else {
			System.out.println(sumAllGrades(grades) + " - grade below B; you will not get credit for this course");
		}
	}
		
	public static double sumAllGrades(double[][] array) {
		double sum = 0;
				
		for (int i = 0; i < array.length; i++) {
			for (int j = 0; j < array[i].length; j++) {
				sum += array[i][j];	
			} 		
		}
		sum = (Math.round(sum) * 100) / 1000;
		return sum;
	}
	
		public static double averageAllGrades(double[][] array) {
			double sum = 0;
			double average = sum / array.length;
			
			for (int i = 0; i < array.length; i++) {
				for (int j = 0; j < array[i].length; j++) {
					sum += array[i][j];	
				} 
				average = sum / array.length;
				average += average;
			}
			return average;
		}