Please help me to solve this problem.

Consider an 802.11 OFDM system having the following parameter values: 64-point transform with 48 message-occupied bins, OFDM symbol time = 4usec, CP time = 0.8usec, data modulation = 16-QAM, error-correction code rate = 3/4. Find the followings:

1) Sample rate

2) Sample time

3) Code bits per subcarrier

4) Code bits per OFDM symbol

5) Data bits per OFDM symbol

6) Data rate

7) If the channel maximum delay spread = 20 samples, is the specified CP time adequate for mitigating the channel ISI?