Write a program that computes the cost of a long distance call. The cost of the call is determined
according to the following rate schedules.
a. A call made between 8:00 AM and 6:00 PM is billed at a rate of 6 rupees per minute.
b. A call made before 8:00 AM or after 6:00 PM is charged at a rate of 3.75 rupees.
According to this schedule, if a call starts at any time between 8:00 AM and 6:00 PM, and it ends
after 6:00 PM then it will be charged at the rate of 6 rupees per minute for the time before 6:00
PM and for the rest of the time the rate will be 3.75 rupees per minute. For
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