I UPvoted your comment. Aside from everything. In writing a contract, it's very common to write price with numbers and letters in brackets next to them. E.g. 1

I UPvoted your comment. Aside from everything. In writing a contract, it's very common to write price with numbers and letters in brackets next to them. E.g. 1000$ ( one thousand dollars ), exactly because typos happen. The decision what a typo is is made by the parties, in case of dispute then by several courts ( based on the evaluation of the contract ). That's at least in continental law system. There's a way to specify a 3rd party court ( non-corrupted one, called arbitrage ) which can solve disputes for that contract. Corruption of judges problem is being fixed also in several ways. Usually decisions in high courts are decided by 3 judges ( again continental law ) and sometimes a jury ( prevailing in anglo-saxon law system ). Also there is a way to appeal the decision of the court to a higher court(s).