for synco answers

Book applications/Chapter 01/FinancialCalculations/Calculations.cs

using System; using System.Threading.Tasks; namespace FinancialCalculations { public class Calculations { public static decimal CalculateFutureValue(decimal monthlyInvestment, decimal monthlyInterestRate, int months) { double dMonthlyInvestment = Convert.ToDouble(monthlyInvestment); double dMonthlyInterestRate = Convert.ToDouble(monthlyInterestRate); double dMonths = Convert.ToDouble(months); double dFutureValue = dMonthlyInvestment * (Math.Pow(1 + dMonthlyInterestRate, dMonths) - 1) / dMonthlyInterestRate; decimal futureValue = Convert.ToDecimal(dFutureValue); return futureValue; } public static decimal CalculateMonthlyInvestment(decimal futureValue, decimal monthlyInterestRate, int months) { double dFutureValue = Convert.ToDouble(futureValue); double dMonthlyInterestRate = Convert.ToDouble(monthlyInterestRate); double dMonths = Convert.ToDouble(months); double dMonthlyInvestment = dMonthlyInterestRate * dFutureValue / (Math.Pow(1 + dMonthlyInterestRate, dMonths) - 1); decimal monthlyInvestment = Convert.ToDecimal(dMonthlyInvestment); return monthlyInvestment; } public static double CalculateSYDDepreciation(double cost, double salvage, double life, double period) { double SYDValue = (cost-salvage) * (life-period+1) * 2 / ((life)*(life+1)); return SYDValue; } } }