A structural engineering consulting company is examining its cash flow requirements for the next 7 years. The company expects to replace office machines and computer equipment at various times over the 7 year planning period. Specifically, the company expects to spend $21,000 for two years from now, $24,000 during the 3 rd year, which decreases by $2000 from 4 through 6 and $30,000 during the 7th and 8th year and $23,000 during 9th year. What is the present worth of the planned expenditures at an interest rate of 10% per year?