Engineering Economy

Please Solve Hand Writing!!!!

1. How much money will be accumulated in 7 years with an initial deposit of $7,000 now, $5,000 one year from now, $4,000 5 years from now, and a withdrawal of 3500 three years from now in an account that earns 8% per year the first three years and 12% per year for the last four years? (first draw the cash flow diagram)