Shell script introduction, lab: arithmetic operations

Shell Scripting
#1

Hi
I need help in this lab question, I have got correct result but lab is marking my answer as incorrect.
question: Create a shell script called /home/bob/calculate-price.sh and it must accept 2 numbers as command line parameters $1 and $2 . It must print the product (multiplied value) of the numbers as output. But this time in a new format - The total price for items is 1000 dollars

my answer is :

bob@caleston-lp10:~$ cat /home/bob/calculation.sh
price=$(( $1 * $2 ))

echo “The total price for items is ${price} dollars”
bob@caleston-lp10:~$ bash /home/bob/calculation.sh 4 5
The total price for items is 20 dollars
bob@caleston-lp10:~$ bash /home/bob/calculation.sh 10 100
The total price for items is 1000 dollars

Please anyone explain about this question and solution

#2

Do you have a link to the lab please? And I will check.

#3

yes, it is

#4

You probably did not name the script file correctly or didn’t have it in Bob’s home directory:

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