A factory has a secret way of accounting. When they earn 300 yuan, it is recorded as - 240 yuan; when they use 300 yuan, it is recorded as 360 yuan. Guess how much yuan they may record when they use 100 yuan? When they earn 100 yuan, how much is it? Give me your reasons | Math enthusiast | Mathematical art

A factory has a secret way of accounting. When they earn 300 yuan, it is recorded as - 240 yuan; when they use 300 yuan, it is recorded as 360 yuan. Guess how much yuan they may record when they use 100 yuan? When they earn 100 yuan, how much is it? Give me your reasons

∵ the difference between the income of 300 and 240 is 60, and the difference between the income of 300 and 360 is 60. Therefore, the income of 100 yuan is recorded as 100 + 60 = 160 yuan, and the income of 100 yuan is recorded as - (100-60) = - 40 yuan

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