Please answer the question on paper , and show all of the steps for the answer.

You need $8,000 in two years. In order to meet this objective, you are willing to do two things: first, you commit $50 a week into a sinking fund paying 2.5% compounded weekly; second, you make a one-time exactly one year from now in an account paying 4% compounded every 4 months. What should be the size of this one-time deposit