public QuarterBalanceDTO CalculateQuarterBalance(int QuarterNum)
        {
            int income  = this.GetIncomeForQuarter(QuarterNum);
            int outcome = this.GetOutcomeForQuarter(QuarterNum);
            QuarterBalanceDTO result = new QuarterBalanceDTO();

            result.Income  = income;
            result.Outcome = outcome;
            return(result);
        }
        public IEnumerable <QuarterBalanceDTO> GetYearBalancePerQuarter()
        {
            List <QuarterBalanceDTO> yearBalance = new List <QuarterBalanceDTO>();

            for (int i = 1; i <= 4; i++)
            {
                QuarterBalanceDTO quarterBalance = new QuarterBalanceDTO();
                quarterBalance.Income  = this.GetIncomeForQuarter(i);
                quarterBalance.Outcome = this.GetOutcomeForQuarter(i);
                yearBalance.Add(quarterBalance);
            }

            return(yearBalance);
        }