An investment

How long will it take for an investment to double at a simple interest rate of 5.10% p. A. ?
Express the answer in years and months, rounded up to the next month.

Correct result:

y =  1
m =  2


p=1+5.10100=1.051  pn=2 nlnp=ln2 n=ln(2)/ln(p)=ln(2)/ln(1.051)13.9348  n1=n=13.9348=14  y=n1/12=14/12=1
m=n112 y=1412 1=2

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