30 dB amplification as a voltage ratio is \$10^{30/20}\$ = 31.62.
Given that the 2nd stage has a gain of 10 the first stage has a gain of 3.16 hence, R1 approximately equals 3.162 kohm.
30dB is amplification of 1000 times
30 dB is a power ratio of 1000 and a voltage ratio of \$\sqrt{1000}\$