Java: Grade Activity with Inheritance

Hello Experts at Experts Exchange:

I'm working on an assignment that I need clarification and help upon. The constriction is that there is no constructor in the superclass, and the super-class cannot be modified.  The Assignment is supposed to output something similar to following below. The first two questions asked can change because they are based on user input:

How many Essay questions are in the course? 10

How many Essay questions did the student miss? 4

Each question counts 10.0points.

The Grammer Score: 18.0

The Spelling Score: 12.0

The Correct Length Score: 12.0

The Content Score: 18.0

The exam score is 60.0

The exam grade is D

The constriction is that there is no constructor in the super class, and the super-class cannot be modified. The problem that I am currently having is setting up the arithmetic value(s) to provide accurate result.

Here is the code so far:

-Base Class-

public class GradeActivity
{
	private double score;

	public void setScore(double s)
	{
		score = s;
	}
	public double getScore()
	{
		return score;
	}
	public char getGrade()
	{
		char letterGrade;
		if(score >= 90)
			letterGrade = 'A';
		else if(score >= 80)
			letterGrade = 'B';
		else if(score >= 70)
			letterGrade = 'C';
		else if(score >= 60)
			letterGrade = 'D';
		else
			letterGrade = 'F';
		return letterGrade;
	}
}

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The driver and sub class is below
DriverClass.javaEssay.java