using System;

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DateTime start=new DateTime(2021,11,1,11,0,0);

DateTime end=new DateTime(2021,11,22,16,0,0);

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TimeSpan duration=end-start;

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Console.WriteLine($"Timespan : {duration}");

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double hourPrice=5;

double dayPrice=30;

double weekPrice=90;

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int maxHours=(int)(dayPrice/hourPrice);

int maxDays=(int)(weekPrice/dayPrice);

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double totalprice=0.0;

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int weeks=(int)(Math.Floor(duration.TotalDays / 7));

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totalprice += weekPrice * weeks;

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duration = duration.Subtract(TimeSpan.FromDays(weeks * 7));

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int hours = (int)Math.Ceiling(duration.TotalMinutes / 60);

int days = hours/24;

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if (days>=maxDays) {

    totalprice += weekPrice;

} else {

    totalprice += (dayPrice * days);

    duration = duration.Subtract(TimeSpan.FromHours(days*24));

    int hours2 = (int)Math.Max(0, Math.Ceiling(duration.TotalMinutes / 60));

    totalprice += (hours2>maxHours) ? dayPrice : hourPrice * hours2;

}

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Console.WriteLine($"Total price : {totalprice}");

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