According to the contract,please read carefully in the part,written like this:
II. The salary treatment

1.Direct payment

__5200___ RMB / Lesson. The whole salary will be paid monthly (the first three working days of every month). All is paid with RMB from the day of starting work each term to the end of each term. 70% of the salary can be changed into foreign currencies monthly.

Your contract stipulates '__5200___ RMB / Lesson (sic).'

Unfortunately for me, I only make 80 RMB a lesson! By contrast, you must be the most highly paid foreign teacher in China, or else much more likely, the (Chinese, I presume) composer of the contract's English level is not up to that required for him to duly perform the task he was assigned..........LOL! I also presume him to be a teacher of (Chinese?) English........LOL again!!