Below please find links to archived Q&A discussion for the Building a Cash Register course.
Exercise 1.1: Shut the Shop!
Exercise 1.2: Manually Add It Up?
Exercise 1.3: Short-Term Memory
Exercise 1.4: I Have to Scan It More Than Once?
Exercise 1.5: Bleep Bleep
Exercise 1.6: Over the Moon
Exercise 1.7: You Deserved It!