Today we shall write the script to calculate the simple interest for given amount. We use the same traditional formula which we used in your childhood i.e is ptr/100. To calculate SI we need to need the data about principal amount,rate of interest and time period. Let us start the script

echo “Enter the principal amount:”
read p
echo “Enter the rate of interest:”
read r
echo “Enter time period”
read t
i = ` expr $p \* $t \* $r`
i = ` expr $i / 100 `
echo ” Hence interest is $i “

output:

Enter the principal amount:1000
Enter the rate of interest:5
Enter the time period:2
Hence interest is:100