If a noiseless 4-kHz channel is used to transmit digital signals with 8 different values, what is the maximum data rate in kbps?

If a noiseless 4-kHz channel is sampled using 4 bit samples, what is the maximum data rate in kbps?

Television channels are 6MHz wide. What is the maximum data rate of a television channel be sent if QAM128 signaling (with 128 levels) is used? Assume a noiseless channel and express your answer in Mbps