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Answer:
9%
Step-by-step explanation:
Given data
Principal= 400
time= 4 months
r= 12%
SI= 12
SImeple interest
12=PRT/100
susbstitute
12= (400*r*4/12)/100
12SI= 400*r*0.333/100
12=133.2r/100
cross multiply
1200= 133.2r
r= 1200/133.2
r= 9.009
Hence the rate is 9%