Holding period and annual (investment) returns. Bohenick Classic Automobiles restores and rebuilds old classic cars. The company purchased and restored a classic 1957 Thunderbird convertible 6 years ago for $7,800.00. Today at auction, the car sold for $62,400.00. What are the holding period retum and the annual return on this investment? What is the holding period retum of the car? % (Round to two decimal places.)