Answer: Because the janitor is aware of your plight, the first thing to consider is this being a trick to extort you or to waste your time. After considering it to be a trick, you still have to consider it to be true. This makes it a game of 50:50 chance ( that is equal chance to loss or win).
To approach this situation, you have to define an agreement with the janitor. The agreement should be "send me the chemistry master and I will pay you after I have written the exam to confirm it is actually a chemistry master or pay you 1/10 of your amount if it is not, to compensate your efforts". After sending this agreement, you should focused on your studies like you're not expecting a positive response from him.
Negotiation should not be involved in the agreement, as it will waste your time of studies.
The Principle of Cross-Cutting tells us that a fault must be older than the rock it cuts. Cross-cutting in geology was formulated by Nicolas Steno, a Danish geologist in the mid-1600's. It is usually used in combination with radiometric age dating, which can tell the geologist how old the rock is.
When you here that term is usually refers WWII and the Nazi's. Concentration camps were basically huge "prisons" or barracks where the Nazi regime placed people deemed undesirable to the Aryan race. It was were a place where these people were labeled by numbers and all there possessions were taken away. There was very little food, and poor sanitary conditions. 11 million people were killed in these camps. 6 million Jews were the greatest number killed. The other 5 million consisted of other types of people that the Nazi's considered undesirable- such as Roma Gypsies, persons with disabilities, homosexuals.
It has been theorized that increased awareness of death, called mortality salience, leads people to have lighter penalties to those who break moral cultural traditions, respond more positively to people who criticize their country, show disrespect for cultural icons, such as flags. give larger rewards to people who uphold cultural standards.