how much does one day cost to go to the great wall of china?

Chadman, it depends how you go there. If go there by public transportation means, it won't cost too much money. The round-trip bus ticket fares are CNY24. The ticket price for Badaling is CNY45. So you can just use CNY 100 to finish your trip to the wall. Of course, it costs a little more if you buy food, drinks and some souvenirs.