Can you help me please...

Write a Java application, to be called GpaCalculator, which will return a grade point average (GPA) when given a range of decimal figures representing a selection of exam marks. The GpaCalculator should assign a GPA value to each exam mark, and then calculate the average grade point value for all the marks entered. The GPA points for individual marks are given below:

(i) A mark ranging from 90 to 100% is awarded a GPA of 4.0 (ii) A mark ranging from 80 to 89%: is awarded a GPA of 3.5. (iii) A mark ranging from 70 to 79%: is awarded a GPA of 3.0. (iv) A mark ranging from 60 to 69%: is awarded a GPA of 2.5. (v) A mark ranging from 55 to 59%: is awarded a GPA of 2.0. (vi) A mark ranging from 50 to 54% is awarded a GPA of 1.5. (vii) A mark ranging from 45 to 49% is awarded a GPA of 1.0. (viii) A mark below from 45% is awarded a GPA of 0.

The GpaCalculator application should prompt the user to enter a series of integer or decimal values ranging from 0 to 100. These values should be entered one at a time and, if a value of ââ?¬Å?-1ââ?¬Â? is entered, then the GpaCalculator application should terminate. Here is an example of the GradeClassifierââ?¬â?¢s input and output for valid data:

Example of GpaCalculator�s output for valid input :

Enter a mark between ââ?¬Å?0ââ?¬Â? and ââ?¬Å?100ââ?¬Â? or ââ?¬Å?-1ââ?¬Â? to exit: 91 Total number of marks entered so far: 1. GPA = 4.0 Enter a mark between ââ?¬Å?0ââ?¬Â? and ââ?¬Å?100ââ?¬Â? or ââ?¬Å?-1ââ?¬Â? to exit: 89 Total number of marks entered so far: 2. GPA = 3.75 Enter a mark between ââ?¬Å?0ââ?¬Â? and ââ?¬Å?100ââ?¬Â? or ââ?¬Å?-1ââ?¬Â? to exit: -1 Total number of marks entered: 2. GPA = 3.75. Application terminated.

NOTE: The GpaCalculator application should also respond appropriately to invalid input (by displaying an error message if the user enters a number which is below -1 or above 100). The deadline submission date for this assignment is November 8, 2011. Late submissions will be penalized.