Please read carefully:

To see the usefulness of indexed addressing, consider a simple example involving a list of test scores for students taking a given course. Assume that the list of scores, beginning at location LIST. Each record consists of the student's identification (ID) number (4 bytes), followed by the scores the student earned on 3 tests (each test 4 byte). There are n students in the class, and the value n is stored in location LOCN immediately in front of the list. The addresses given for the student IDs and test scores assume that the memory is byte addressable and that the word length is 32 bits.

Write a subroutine that find the address of a certain student by matching his/her student identification number and calculate the average of his/her three tests. Parameters should be passed on the stack; the address of the student id and the average should be also returned on the stack. The content of registers should not be affected by the subroutine.