#!/bin/bash

: > /tmp/salary.txt
echo 'EMPNAME | SALARY | Q1 | Q2 | Q3 | Q4 | Avg Q | Expected Sal | Incremented Sal | Performance |' > /tmp/salary.txt
while :
do
    printf "Enter employee name, QUIT or EXIT to finish:- "; read -r name
    if [ "${name}" = "QUIT" ] || [ "${name}" = "EXIT" ]
    then
        echo "Finalising file inside '/tmp/salary.txt'!"
        break
    fi
    printf "Enter employee salary:- "; read -r salary
    printf "Enter Q1:- "; read -r q1
    printf "Enter Q2:- "; read -r q2
    printf "Enter Q3:- "; read -r q3
    printf "Enter Q4:- "; read -r q4
    # Multiply all inputted INTEGER ONLY values by 100!
    salary=$(( salary*100 ))
    q1=$(( q1*100 ))
    q2=$(( q2*100 ))
    q3=$(( q3*100 ))
    q4=$(( q4*100 ))
    avg=$(( (q1+q2+q3+q4)/4 ))
    av=$(( (salary*avg) ))
    inc_salary=$(( (salary*av) ))
    exp_salary=$(( (salary+av) ))
    if [ "${avg}" -gt "700" ]
    then
        desc="BEST"
    fi
    if [ "${avg}" -le "700" ] && [ "${avg}" -ge "500" ]
    then
        desc="AVG"
    fi
    if [ "${avg}" -lt "500" ]
    then
        desc="ON TRACK"
    fi

    avg_str=$( printf "%.2f" "$(( avg ))e-2" )
    av_str=$( printf "%.2f" "$(( salary*avg ))e-6" )
    inc_salary_str=$( printf "%.2f" "$(( inc_salary ))e-12" )
    exp_salary_str=$( printf "%.2f" "$(( (salary*10000)+av ))e-6" )
    echo "$name | $(( salary/100 )) | $(( q1/100 )) | $(( q2/100 )) | $(( q3/100 )) | $(( q4/100 )) | ${avg_str} | ${exp_salary_str} | ${av_str} | ${desc} |"
    echo "$name | $(( salary/100 )) | $(( q1/100 )) | $(( q2/100 )) | $(( q3/100 )) | $(( q4/100 )) | ${avg_str} | ${exp_salary_str} | ${av_str} | ${desc} |" >> /tmp/salary.txt
done
clear
cat /tmp/salary.txt
exit 0

Enter employee name, QUIT or EXIT to finish:- Dave
Enter employee salary:- 11377
Enter Q1:- 3
Enter Q2:- 4
Enter Q3:- 5
Enter Q4:- 6
Dave | 11377 | 3 | 4 | 5 | 6 | 4.50 | 11888.96 | 511.96 | ON TRACK |
Enter employee name, QUIT or EXIT to finish:- Baz
Enter employee salary:- 12347
Enter Q1:- 6
Enter Q2:- 7
Enter Q3:- 6
Enter Q4:- 7
Baz | 12347 | 6 | 7 | 6 | 7 | 6.50 | 13149.55 | 802.55 | AVG |
Enter employee name, QUIT or EXIT to finish:- Tamsan
Enter employee salary:- 15678
Enter Q1:- 6
Enter Q2:- 7
Enter Q3:- 8
Enter Q4:- 8
Tamsan | 15678 | 6 | 7 | 8 | 8 | 7.25 | 16814.65 | 1136.66 | BEST |
Enter employee name, QUIT or EXIT to finish:- QUIT
Finalising file inside '/tmp/salary.txt'!

EMPNAME | SALARY | Q1 | Q2 | Q3 | Q4 | Avg Q | Expected Sal | Incremented Sal | Performance |
Dave | 11377 | 3 | 4 | 5 | 6 | 4.50 | 11888.96 | 511.96 | ON TRACK |
Baz | 12347 | 6 | 7 | 6 | 7 | 6.50 | 13149.55 | 802.55 | AVG |
Tamsan | 15678 | 6 | 7 | 8 | 8 | 7.25 | 16814.65 | 1136.66 | BEST |
bazza@amiga-MacBookPro:~/Desktop/Code/Shell$ 
bazza@amiga-MacBookPro:~/Desktop/Code/Shell$ # Now check with python...
bazza@amiga-MacBookPro:~/Desktop/Code/Shell$ 
bazza@amiga-MacBookPro:~/Desktop/Code/Shell$ python
Python 2.7.15+ (default, Nov 27 2018, 23:36:35) 
[GCC 7.3.0] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> ((11377*4.5)/100)+11377
11888.965
>>> ((12347*6.5)/100)+12347
13149.555
>>> ((15678*7.25)/100)+15678
16814.655
>>> _