Simple, in MS paint, get the dotted line box tool thing on the top left bar, press CTRL+A, right click on the pic, go to stretch/skew , on the top of the window that comes up put 50% in both text boxes (without typing the % sign). Then press ok, and it should be half the size. Then go to the very bottom of the picture, in the right hand side, click on the corner and drag it until it reaches the edge of the image you shrank earlier.
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░░░░ You know what's annoying?
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█ People who don't read signatures.