1) 4 от 8, 8-100%, 4-х, х=4*100/8=50%
2)2 от 10, 10-100%, 2-х, х=2*100/10=20%
3)12 от 48, 48-100%, 12-х, х=12*100/48=25%
4)45 от 300, 300-100%, 45-х, х=45*100/300=15%
5)64 от 400, 400-100%, 64-х, х=64*100/400=16%
6) 138 от 120, 120-100%, 138-х, х=138*100/120=115%