A club has a secret bookkeeping method. If the income of 500 yuan is - 600 yuan. Q: how much is the income of 100 yuan? Is it - 120 or 1000?

A club has a secret bookkeeping method. If the income of 500 yuan is - 600 yuan. Q: how much is the income of 100 yuan? Is it - 120 or 1000?

Income 500 yuan, record - 600 yuan, prove cost 1100 yuan
So the income of 100 yuan is - 1000 yuan