Write a shell script to display the following details in a pay list - Pay slip details, House rent allowance, Dearness allowance, Provident fund. HRA is to be calculated at the rate of 20% of basic, DA at the rate of 40% of basic and PF at the rate of 10% of basic. - OS

i="y"
while [ $i = "y" ]
do
echo "Please enter your Basic:"
read basic
echo "PAY SLIP DETAILS"
echo "1. HOUSE RENT ALLOWANCE"
echo "2. DEARNESS ALLOWANCE"
echo "3. PROVIDENT FUND"
echo "your choice:"
read ch
case $ch in
1) hra=`expr $basic \* 20 / 100`
echo Your HOUSE RENT ALLOWANCE is Rs. $hra;;
2) da=`expr $basic \* 40 / 100`
echo Your DEARNESS ALLOWANCE is Rs. $da;;
3) pf=`expr $basic \* 10 / 100`
echo Your PPOVIDENT FUND is Rs. $pf;;
*) echo "Not a valid choice";;
esac
echo "Do u want to continue ?"
read i
if [ $i != "y" ]
then
exit
fi
done