Li had earned 3000, 4000, and 5000 yuan respectively for three consecutive months by serializing his novels online. Therefore, his personal income should be subject to personal income tax in accordance with the tax law. The calculation formula of personal income tax is: personal income = comprehensive income x tax rate-quick deduction. The comprehensive income referred to the income obtained by individuals, including wages, bonuses, subsidies, subsidies, stock options, equity gains, interest, dividends, bonuses, property lease, property inheritance, transfer payments, and so on. According to the question, Li's personal income was 3000 yuan, 4000 yuan, and 5000 yuan respectively. As he did not know whether his royalties included royalties, royalties, and transportation fees, it was impossible to calculate his total royalties. Assuming that his total remuneration was x yuan: Personal income = 3000 yuan × 1% + 4000 yuan × 2% + 5000 yuan × 3% = 100 + 800 + 1500 = 3300 yuan Therefore, Li should pay personal income tax of 3300 yuan.