An automobile manufacturing company wants to sign a contract with a distributer in China to provide shaft wheel spare parts. This year (year 1), the cost for shaft wheel spare parts is $9,000. Based on closure of a new contract with the distributer and volume discounts, the company expects this cost to decrease. If the cost in year 2 and each year thereafter decreases by $560, what is the equivalent annual cost for a 5-year period at an interest rate of 10% per year? Problem 9: Calculate the present worth of a geometric gradient series with a cash flow of $35,000 in year 1 and decreases by 5% each year through year 6 . The interest rate is 10% per year