The compound interest on $\text{Rs. }30,000$ at $7\%$ per annum is $\text{Rs. }4,347$. The period (in years) is:

Given:
Principal ($P$) = $\text{Rs. }30,000$
Compound Interest ($\text{CI}$) = $\text{Rs. }4,347$
Rate ($R$) = $7\%$ per annum

Total Amount ($A$) = $P+\text{CI}=30000+4347=\text{Rs. }34,347$.
Using the compound interest formula:

$$A=P{\left(1+\frac{R}{100}\right)}^n$$

$$34347=30000{\left(1+\frac{7}{100}\right)}^n$$

$$\frac{34347}{30000}={\left(\frac{107}{100}\right)}^n$$

Dividing the left fraction numerator and denominator by $3$:

$$\frac{11449}{10000}={\left(\frac{107}{100}\right)}^n$$

Notice that $107^2=11449$ and $100^2=10000$:

$${\left(\frac{107}{100}\right)}^2={\left(\frac{107}{100}\right)}^n⟹n=2\text{ years}$$