8.1 :
1. 19/50 = 0.38 = 38%
2. 13/20 = 0.65 = 65%
8.2 :
3. 3/5 = 0.6 = 60%
4. 62.5% = 0.625 = 5/8
5. 0.24 = 24% = 6/25
6. 31/50 = 0.62 = 62%
7. 7/10 = 0.7 = 70%
8.3 :
8. 12 = 0.30x......12/0.30 = x......x = 40 <==
9. 0.45(20) = 9 <==
10. 18/30 = x/100......30x = 1800...x = 60% <==
11. 56 = 0.80x....56/0.80 = x.....70 <==
cant see the rest