Mr. B is planning his 5-month outing. Mr. B estimates that he will have to spend 12 million VND at the beginning of each month to go out and enjoy himself everywhere. He estimates that if he saves money, he will earn an annual interest rate of 7.5% and 8.5% for his vacation. B. Knowing that he has to save every month at the end of the next 10 months for the next 10 months to save money. enough money to fund this outing. So, how many VND should Mr. B save each month?