a) Write function and perform following calculation in MS Excel. PlacesTargetProductionAchievement (%)GradeDolakha48006000??Lalitpur50004500??Mustang50005000??Average?i) Calculates Achievement in…

a) Write function and perform following calculation in MS-Excel. PlacesTargetProductionAchievement (%)GradeDolakha48006000??Lalitpur50004500??Mustang50005000??Average?i) Calculates Achievement in percentage. ii) Calculate failure or achievement in average percentage. iii) Calculate grade A+ for more than 100% achievement, A for 100% achievement; B for below 100% achievement. b) Explain the following DOS commands with syntax. i) How do you protect files in DOS? ii) What is the difference between RD and DEL commands? iii) How can you copy a file from one directory to another in DOS? iv) What is the use of TREE and LABEL commands? v) What is the use of display the contents of a text file without opening it?