In the Cell 'H13' of Sheet 'Payroll Data', the 'Formula' was not set to 'G13-B13*$B$24'.
To accustom to several different language-speaking countries. One program is often used internationally so having a language setup is very important.
Ok if lets say a young child at the age of like 6-7 was allowed to play grand theft auto by his/her parents maybe the child would understand incorrectly and start doing what the people do in the game this may cause to serious trouble jail time or even death. In this case dont let your kids play underrated games or watch underrated movies.
Hope that helped you understand more.
If you go to a college website you will see the it has .edu in the URL extensions.