<image> Mr. Li wholesaled a batch of cucumbers at 2.1 yuan per kilogram to sell in town. To facilitate sales, he brought some spare change with him. He initially sold some at the market price and then reduced the price. The relationship between the kilograms of cucumbers x sold and the amount of money y yuan (including spare change) he has is shown in the graph. Based on the graph, answer the following questions:
(1) How much spare change did Mr. Li bring with him?
(2) What was the price per kilogram of cucumbers before the price reduction?
(3) After selling cucumbers for a few days, their appearance worsened, and he sold the remaining cucumbers at a reduced price of 1.6 yuan less per kilogram. At this point, he has 530 yuan (including the spare change). How many kilograms of cucumbers did he originally wholesale?
(4) Did Mr. Li incur a loss or make a profit? If there was a loss (or profit), how much was it?