A parking Garage charges (Assignment)

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I need help. Am required to design a parking garage charge system in My Assignment still new in C++.

A parking garage charges a $2.00 minimum fee to park for up to three
hours. The garage charges an additional $0.75 per hour or part thereof
in excess of three hours. Assume that no car parks for longer than 24
hours at a time. To determine how long a car was parked, both the
entry time and exit time are converted to minutes. The entrance time
in minutes is then subtracted from the exit time in minutes, and these
minutes are converted back to hours and minutes before the parking fee
is calculated.
Write a program that calculates and prints the parking charges for
customers who parked in this garage. Twenty customers use the parking
garage at any given time. For each customer the program has to:
 Input the time when the parking garage was entered
 Input the time when it was exited
 Convert both the entry and exit time to minutes
 Calculate how long the car was parked in minutes (parked time)
 Convert the parked time in minutes back to time in hours and minutes
 Calculate the charge (amount owed by the customer)
 Display the receipt for the customer (display entry and exit times
(in 24h00 format, duration for parked time and charge
 Calculate the total of daily receipts
 Finally the total amount of all the receipts should be displayed
with informative messages
The program should consist of five functions. Declare constants for
the number of minutes in an hour, the minimum fee ($3.00), the cut-off
time of three hours, the hourly fee of $0.75 and the number of
customers (20). Follow the conventions of the Study Guide and
prescribed text when writing the program.

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