Question My RAM is 4.00 GB but it says 3.89 GB usable

Mar 24, 2019
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So my RAM is 4.00 GB but it says 3.89 GB usable is there any solution to make it 4 GB usable if not, I would like to know why is 3.89 GB usable when it is a 4 GB RAM
Laptop spec:
CPU: Intel core i3-7100u 2.40 GHz
RAM: 4.0 GB DDR3
System Manufacturer: Acer
GPU: Intel HD Graphics 620 (1.9 GB GPU memory)
Laptop: Travel mate p238-G2-M33FY
 

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