Answer:
This problem requires us to calculate Dream Inc change in net working capital, or NWC. The woking capital is the company ability to pay its short term liabilities. In other words it shows how liquid company is.
Working capital is difference between current asset and current liability.
2017 NWC = 3,190 - 1,430 = 1,710 -A
2018 NWC = 3,240 - 1,670 = 1,570-B
Change in NWC = A-B = $ 140
The company net working capital has decreased by 140 dollars.