In January of 2003, Jaylen deposited $1,450 into an investment account earning 5% interest compounded semiannually. If there are no other deposits or withdrawals from the account find the total interest earned by the end of December in 2017.

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?