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A math club has a "secret" accounting method. When they use 300 yuan, it is recorded as - 240; when they earn 300 yuan, it is recorded as + 360 Guess, when they use 100 yuan, how much is it? When they earn 100 yuan, how much is it? Explain your reason
300 - (- 240) = 600 yuan
Although the data recorded are different, there is still a difference of 600 yuan between 300 yuan spent and 300 yuan earned
-300 - (- 240) = - 60 yuan
It is equivalent to reducing the amount of money spent by 60 yuan and adding 60 yuan to the amount of money earned. That is to say, they take 60 yuan as the dividing point between the amount spent and the amount earned
Therefore, 100 yuan is recorded as - 40 yuan, while 100 yuan is recorded as + 160 yuan
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