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80x80 is the pixel size, so to fit the space properly, should resize or crop an 80x80 pixel portion of your image.
25kb is the file size, so once you've resized the image, then save it as jpeg and ensure it's under 25kb in size. For an 80x80 pixel image, it should be.
The main trick is to resize/crop first, then save as jpeg and the file size should already be under 25kb.
I hope that helps, let me know if you need any more info.
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