1) 3*100/4 = 75
7*100/20 = 35
9*100/25 = 36
(1 3/10)*100 = (13/10)*100 = 13*100/10 = 130
(3 1/2)*100 = (7/2)*100 = 7*100/2 = 350
(5 1/4)*100 = (21/4)*100 = 21*100/4 = 525
2) 1,8 * 100 = 180
0,28 * 100 = 28
0,05 * 100 = 5
6,72 * 100 = 672
9,03 * 100 = 903
9,9 * 100 = 990