关于FSA，问一个问题 source, amount, assets, decrease

wanghaha

问个问题， FSA page56里面，那个Investing cash flow部分中，decrease in asset(a source)是5000，这个是怎么得到的？还有，下面的那一段：if the land had been sold at a loss, we would have subtracted the loss amount from the decrease in assets.是什么意思？

谢谢。