# Using bc for math with a here document.
# Calculates sales tax.

echo -n "Please enter the amount of purchase: "
read amount
echo

echo -n "Please enter the total sales tax: "
read rate
echo

result=$(bc << EndOfCommands
scale=2   /* two decimal places */

tax = ( $amount * $rate ) / 100
total=$amount+tax

print total

EndOfCommands
)

echo "The total with sales tax is: \$ $result."