Alex and Jamie Clark are diligent budgeters. They allocate monthly cash flow to cover credit card payments and mortgage obligations. Their annual mortgage breakdown includes $2,000 in principal, $8,000 in interest, $1,000 in taxes, and $500 in insurance. They also set aside $50 each month in a savings account, which earns $100 in interest annually. Based on this, what is their total contribution to their net worth for the year?