Answer:
9%
Step-by-step explanation:
The formula is Ra=Rf+(Rm-Rf)Ba
Ra=10%
Ba=1.2
Rf=4%
Rm=?
Ra=Rf+(Rm-Rf)*Ba
10%=4%+(Rm-4%)*1.2
10%=4%+1.2Rm-4.8%
10%+4.8%=4%+1.2Rm
14.8%-4%=1.2Rm
Rm= 10.8%/1.2
Rm=9%
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