Answer:
1. P=B×R
80×0.1=8
P=8
2. B=P÷R
120÷0.3=400
B=400
3.P=B×R
100×0.1=100
P=100
4. R=P÷B
20÷200=0.1
R=10%
5. P=B×R
90×0.25=22.5
P=22.50
6.P=B×R
55×0.15=8.25
P=8.25
7. R=P÷R
12÷88=0.14
R=14%
8. P=B×R
24×0.8=19.2
P=19.20
9.B=P÷R
150÷0.25=600
B=600
10.P=B×R
15×0.5=7.5
P=7.5