How simple this question may look, how hard it is to answer. There are so many dependencies like the client being used, the required signal strength, required data speeds (if a client can connect with 1Mbps, does that count as in range?), the power levels configured (in enterprise you typically want to avoid the maximum power), the environment (in an open area the signal can travel much further than if there are objects that block or absorb the signal). From the two numbers you give, I think 100m is on the high side unless you have absolute free line-of-sight between the client and the AP, which also may mean that if the person turns around and a body is in between the signal is too weak.
The generic issue is that signal degrades by the distance from the AP gradually, and it is really hard to have a universal hard number on coverage.
Most scenarios are around capacity, where you prefer the range rather smaller than larger, or you require proper speeds as in practice if clients are connected at 20Mbps or less, the performance is poor anyway you will need to have a quite strong signal. If you have a mobile low bandwidth backhaul of few Mbps and a single AP, that makes a lot of differences as you can put the AP to maximum power and performance of the wireless is probably not the most relevant parameter.
In office environments I see APs spaced 15m apart or even closer, which means that you are at max 7-8m from the AP. So that is not the coverage range, but an indication of range to have good performance.