using System;

​

public class Program

{

    float fakeBulkBuyPrice;

    int upgradesBought = 3;

    int upgradeBaseCost = 15;

    int bulkAmount = 10;

    float upgradeBulkCost;

    float upgradePastCost;

    float fakeBulkSellPrice;

    int sellCorrect = 10;

    public static void Main()

    {

        Program p = new();

        Console.WriteLine("Buying 10");

        p.CalculateBulkBuyPrice();

        Console.WriteLine("\nSelling 10");

        p.CalculateBulkSellPrice();

    }

    public void CalculateBulkBuyPrice()

    {

        fakeBulkBuyPrice = 0f;

        int fakeBuildingsBuy = upgradesBought;

        float currentUpgradeCost = upgradeBaseCost;

​

        for (int i = 0; i < bulkAmount; i++)

        {

            var x = (float)(currentUpgradeCost * Math.Pow(1.15f, fakeBuildingsBuy));

            fakeBulkBuyPrice += x;

            upgradePastCost = x; // assign last cost

            fakeBuildingsBuy++;

            Console.WriteLine(x);

        }

        fakeBulkBuyPrice = (float)Math.Round((double)fakeBulkBuyPrice);

        upgradeBulkCost = fakeBulkBuyPrice;

        Console.WriteLine(upgradeBulkCost);

    }

​

    public void CalculateBulkSellPrice()

    {

        fakeBulkSellPrice = 0f;

        for (int i = 0; i < sellCorrect; i++)

        {

            Console.WriteLine(upgradePastCost);

            fakeBulkSellPrice += upgradePastCost;

            upgradePastCost = (float)(upgradePastCost) / 1.15f;

        }

        fakeBulkSellPrice = (float)Math.Round((double)fakeBulkSellPrice);

        Console.WriteLine(fakeBulkSellPrice);

    }

}