Apple held its annual Worldwide Developers' Conference (WWDC) on Monday in San Jose, California, unveiling new updates to its operating system, customizable Animoji, new fitness features and more. The

Suppose, every year, you buy a new iPhone at 8388 yuan RMB plus Apple Care+ for 1688 yuan RMB. First, calculate the extra money you have to pay every year. Add the AC cost for the previous year, subtract