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the answer is 45 years
arpit112233:
mark it as branliest
please
kaise krte h
i don't know
let (1+r/100)^15=2, because it has doubled we need it to be 8 time . so we do it as ((1+r/100)^15)^3= 2^3=8 so power becomes 15*3=45
now mark it as branliest
i mean brainlist me mark kaise krte h
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