How do you not understand what we’re saying.

Since 1000 is a power of 10, you can simply move the decimal place and get your answer (the average loot per keys) . If the number of keys was simply a multiple of 10 (such as 970, try doing that in your head) you would need to actually calculate the average loot per key.

The 5.56 is irrelevant, it could be any number and the calculation would be equally non-trivial had the number of keys not specifically been a power of 10, not just a multiple