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Data Sufficiency (DS) | Re: A man invested $P in a certain bank at the rate of r% per annum compou

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Here I need a little help.
May I go ahead with option selection just after recognizing that I need to find one variable only and the value of that variable will be unique.
For example, St.1 gives me R= 20% and from the question stem, I know that A= 1.44P (A is compounded amount and P is the principal amount.)
Now I need to calculate only the value of n(Years) which is going to be single unique. Thus, St.1 is sufficient.

St.2 gives me A= 1.728P in 3 years. Here I can calculate R(Rate of interest)
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