On Your Own

Note: Most programming problems can be solved in a variety of ways. Your solution may not be exactly like your classmates' solutions, but as long as the problem is solved, one method is not necessarily better than another. As you become more proficient with writing scripts, you may find more efficient ways to write code.

$18.$ Your next task is to revise the code of your python $3x.$ py file to determine whether the purchase price for a $0\%$ discount is both less than $50\mathrm{.}00$ and greater than $0.$ One solution is to add an elif clause to check whether the cost entered is greater than $0$ and revise the else clause so it will display a message that any other amount is invalid. Updates to the results section will also be needed. Modify the code and save it as python $4$ xxx$.$ py$.$ Execute the program to test it$.$

Write your code here.