ta for Computation, Analysis, and Reference Chapler 5 Rotrieving Dat worksheet to look up the cost using thc lookup table you created in Question 17, write therect de it can be copied down the column z Write the formula so t 18. Write a formula in cell D13 in the Pricing shown here Basc your answers for Questions 19-20 on the Scores and Grades workshe Student Scores 1 Grading Schemes: 2Name Total Points Letter Grade 3 Joanna 4 Vi 5 Paul 6 Ying 7 Rebecca 8 Roberto 670 3 900 800 700 450 898 694 933 6 0 600 700 Grades worksheet Scores worksheet 19. As shown in the Grades worksheet, final grades are determined using t grading scheme: Students earning over 900 points receive an A o Students carning less than 900 points but at least 800 pointsr eceive a B e Students carning less than 800 points but at least 700 points receive a C . Students carning less than 700 points but at least 600 points receive a D Students carning less than 600 points receive an F Write a formula in cell C3 in the Scores worksheet that determines the final grade for first student based on the grading scheme. Use the appropriate Rcference and Loo function and write the formula so that it can be copied down the column 20. Explain the difference between the lookup table in cells A3:E4 of the Grades w sheet and the lookup table in cells A6:E7 in the same worksheet