Help me with this code!

$1.$ Given the diameter and the height, write a Python function named calculate$\_$cylinder$\_$volume to return $($we solved very similar one in our last assignment but that time we didn't return a value. We printed it$)$ the volume of the cylinder. The volume, v of a cylinder with diameter, d and height h is given by v$=$pi$($d$^2/4)$h

$2.$ Assume a soda can is a perfect cylinder. Write a Python function named count$\_$soda$\_$cans to return the number of soda cans of a given diameter and a given height that is required to be fully filled out of the given bulk volume amount of soda. Here you must use the function calculate$\_$cylinder$\_$volume you wrote above to calculate the volume of the soda can. Here is an example: assume the volume of a soda can calculated is $7\mathrm{.}5$ fluid ounce, and bulk soda volume is $1000$ ounce, you require $133$ soda cans to fully fill them with soda. The left over amount is $2\mathrm{.}5$ soda ounce. Mathematically $1000//7\mathrm{.}5=133\mathrm{.}0.$ Call calculate$\_$cylinder$\_$volume in your function.$]$

$3.$ Write a Python function named calculate$\_$revenue to calculate total sale price of a given amount of product of a given unit price. There is discount per item sold. The default discount amount is $$0\mathrm{.}00$ per item sold. In your main program, calculate the revenues of selling $50$ soda cans worth $$1\mathrm{.}20$ each with no discount. Convert your value to an integer and print it$.$ In your main program, calculate the revenues of selling $500$ soda cans worth $$1\mathrm{.}20$

The expected output of the full code is

$84$

$14$

$165$

$60$

$549$