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Determine the present worth of a geometric gradi- ent series with a cash flow of $50,000 in year 1 and increases of 6% each year through year 8. The in- terest rate is 10% per year. a. $520,573 O b. $420,573 O c. $120,573 O d. $320,573 O e. $220,573 Determine the present worth of a maintenance contract that has a cost of $30,000 in year 1 and annual increases of 6% per year for 10 years. Use an interest rate of 6% per year. O a. $283,019 O b. $183,019 O c. $483,019 O d. $383,019 O e. $583,019