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A student deposited €500 in a savings bank at 2.5% interest. In what time (in years) will he earn as much interest as he invested?

Correct answer:

t =  28.071

Step-by-step explanation:

a=500 eur r=100%+2.5%=1+1002.5=1.025  a  rt = 2 a rt = 2  t   ln r = ln 2  t=lnrln2=ln1.025ln2=28.071



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