First of all, network companies only provide communication fees, and internet access fees also include network usage fees. No matter how long you surf the Internet, you must get it at 38 every month. Look at the first one, 29 hours, no more than 30 hours, so there is no discount on communication fee. If it is calculated at two yuan per hour, then the internet access fee this month is: network usage fee 38+ communication fee 58(29*2)=96.

The second 90 hours, more than 50 hours, but not more than 100, so the preferential policy should be 50% off the communication fee, so the internet access fee this month is: 38+ 90(90*2*50%)= 128.