Suppose you want to buy a small cabin in the mountains four years from now. You estimate that the property will cost $53,500 at that time. How much money do you need to invest each year in an interest-bearing account at the rate of 6% per year to accumulate the purchase price? (Round your answer to the nearest whole dollar.) The investment required each year is

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Each person in an it department of 25 people works on at least one of 3 major projects: system security, program implementation, platform development. 10 people work on system security, 13 work on program implementation, and 12 work on platform development. 4 people work on system security and platform development, 5 people work on program implementation and platform development, and 2 people work on all three projects. how many people work on system security and program implementation?