Why does size of jpg image in resource folder increases 10 times

Its so annoying . I have placed some jpegs in the Resources folder and its size goes up by 10 times and the whole game goes to 101 MB in size and when I place the images in some other folder the project size is acceptable . How do I fix this issue . please suggest a solution

JPEG is a source format. Your artwork is converted by Unity into a format that the GPU on the device can work with. Tell Unity to use compressed texture formats to reduce the size of the build.