The compound interest on Rs 30000 @ 7% p.a is Rs 4347. The period in years is:

2

Principal = Rs.30000, Rate = 7%pa, C.I. = Rs.4347

Amount = 30000 + 4347 = Rs.34347

Amount = P(1 + \(\frac{r}{100}\))^t

34347 = 30000 (1 + \(\frac{7}{100}\))^t

11449 = 10000 (\(\frac{107}{100}\))^t

(\(\frac{107}{100}\))² = (\(\frac{107}{100}\))^t

t = 2 years