(been awhile since i've done this but i'm pretty certain on these)
10.
a.
120*0.60=72
120+72=192
answer: 192
b.
192*0.30=57.60
192-57.60=134.40
answer: 134.40
c.
134.40-120= 14.40
the store made $14.40 on the bicycle
11.
147*0.75=110.25
147-110.25=36.75
answer: 36.75
12.
a.
60*0.06=3.60
60+3.60= 63.60
answer: 63.60
b.
60*0.15=9
60-9=51
answer: 51
c.
51*0.06=3.06
51+3.06=54.06
answer: 54.06