Anyone know how to solve this question?(please show the working), thanks

Q2. A company requires a 300 bps communication link with minimum BER of 10-3. Supplier A has proposed the following specifications for consideration: Signal type: +2 volt Alternate Mark Inverse (AMI) rectangular binary symbols Pulse period: 2.47 ms Bit rate: 400 bps Bit Error Rate: 10-3 Channel noise: Additive white Gaussian noise (AWGN) with two sided power spectral density N/2=10-3W Matched filter deployed Supplier B presented the same proposal except that it deploys a +2 volt polar signal. You have been requested to present your recommendations. Q2. A company requires a 300 bps communication link with minimum BER of 10-3. Supplier A has proposed the following specifications for consideration: Signal type: +2 volt Alternate Mark Inverse (AMI) rectangular binary symbols Pulse period: 2.47 ms Bit rate: 400 bps Bit Error Rate: 10-3 Channel noise: Additive white Gaussian noise (AWGN) with two sided power spectral density N/2=10-3W Matched filter deployed Supplier B presented the same proposal except that it deploys a +2 volt polar signal. You have been requested to present your recommendations