The crystal grows every month 1.2 permille of its mass. For how many months to grow a crystal from weight 177 g to 384 g?

Correct answer:

n =  645.8

Step-by-step explanation:

q=1+1.21000=1.0012  m0=177 g m1=384 g  m1=m0 qn qn=m1/m0  nlogq=log(m1/m0)  n=log(m1/m0)/log(q)=log(384/177)/log(1.0012)=645.8

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