At beginning of this year, ABC Company has a machine worth 1000k, cash 30k, account receivable 200k, inventory 100k, account payable 50k, and notes payable 80k. During this year, ABC had sold 75k of inventory, which brought in 120k in revenue (with half cash and half credit). In addition, the company also paid down 37.5% of the notes payable. What is the change of NWC this year?