Write a shell script to mathematics calculation

Definition: Write a script to calculate gross salary for any number of employees

                                   Gross Salary =Basic + HRA + DA.

                                   HRA=10% and DA= 15%.

File Name : ex19.sh

clear

echo "Enter Basic Salary :\c"

read bs

if [ $bs -lt 1500 ]

then

  hra=`echo $bs \* 10 / 100 | bc`

  da=`echo $bs \* 15 /100 | bc`

else

   hra=500

   da=`echo $bs \* 98/100 | bc`

fi

gs=`echo $bs + $hra + $da | bc`

echo " DA : $da"

echo " HRA :  $hra"

echo "GROSS SALARY : $gs"