Shell Programming and Scripting

shirt=15
black=13.50

echo "how many shirt you want"
read num
echo
echo "Please enter a choice"
echo "1 ---> normal shirt"
echo "2 ---> black shirt"
read choice
echo

if [ $choice = "1" ]; then
    price=`expr $num1 \* $shirt`
    echo "$num1 * $shirt = $price"

elif [ $choice = "2" ]; then
    answer=$(bc <<< "scale=2;$num*$black")
    echo "$num * $black = $answer"
else
    echo "Invalid option"
fi

how many shirt you want
2

Please enter a choice
1 ---> normal shirt
2 ---> black shirt
1

2 * 15 = 30
ictadmin@ubuntu:~/Desktop$