Programming graph question

I need to be able to create a calss that graphs a grade distribution (number of A's, B's, C's D's, and F's) horizontally by printing lines with proportionate numbers of asterisks corresponding to the percentage of grades in each category.
Could anyone help me out? I have no idea where to begin lol :P

This that is along the lines of what i am meaning... here ill just write out the full question lol :P ;)
Create a class that graphs a grade distribution (Number of A's, B's, C's, D's and F's) horizontally by printing lines with proportionate numbers of asterisks corresponding to the percentage of grades in each category. Write methods to set the number of each letter grade; read the number of each letter grade; return the total number of grades; return the percentage of each letter grade as a whole number between 0 and 100, inclusive; and draw the graph. Set it up so that 50 asterisks correspond to 100 percent (each one corresponds to 2 percent), include a scale on the horizontal axis indicating each 10 percent increment from 0 to 100 percent and label each line with its letter grade.
For example, if there are 1 A, 4 B's, 6C's 2 D's and 1 F, the total number of grades is 14, the percentage of A's is 7, the percentage of B's is 29, the percentage of C's is 43, the percentage of D's is 14 and the percentage of F's is 7. The A row would contain 4 asterisks (7 percent of 50 rounded to the nearest interger), the B row 14, the C row 21, the D row 7, and the F row 4.

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