Find Basic Salary,Hra,DA, And Calculate the Net Salary.

echo "Enter Basic Salary: "
read b

hra=0
da=0
if [ $b -gt 1500 ]
then
hra=500
da=`expr $b \* 98 / 100`
else
hra=`expr $b \* 10 / 100`
da=`expr $b \* 90 / 100`
fi
gs=`expr $b + $hra + $da`

echo "Gross Salary is: Rs.$gs"
echo "Details:"
echo "Basic: Rs.$b"
echo "HRA: Rs.$hra"
echo "DA: Rs.$da"

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                OUTPUT
Enter Basic Salary:
15000
Gross Salary is: Rs.30200
Details:
Basic: Rs.15000
HRA: Rs.500
DA: Rs.14700