A company manufactures two different digital codecs, CODEC$1$ and CODEC$2.$ CODEC$1$ samples each analog audio signal $20,000$ times per second and encodes each sample with $18$ bits. CODEC$2$ samples each analog audio signal $30,000$ times per second and encodes each sample with $24$ bits. BR$1$ and BR$2$ are the bitrates of the digital audio signals created by CODEC$1$ and CODEC$2,$ respectively. Select all the statements below that correctly determine R$1$ and R$2.$