1. Find the present worth at i = 10% per year for the cash flow series shown below. [3] 0 2 3 4 5 6 7 8 Year 1 + 90 $90 90 $200 $200 $200 2. Recalibration of sensitive measuring devices costs $8,000 per year. If the machine will be recalibrated for each of 6 years starting 3 years after purchase, calculate the 8-year equivalent uniform series at 16% per year. [3] 3. Determine the time it would take for a given sum of money to double at 4% per year compound interest. [2]