Taxable amount = (300+150+50+100) * 25% =1.5 million yuan.
2. Tax credit limit of 2.AB country:
Country A:150 * 30%+50 * 25% = 625,000 yuan > 200 * 25% = 500,000 yuan.
Country B:100 * 20% = 200,000 yuan.
Therefore, 50+20 = 700,000 yuan can actually be deducted, and125,000 yuan can be carried forward to the next year.
3. Income tax payable in China:
150-70 = 800,000 yuan