This is a question of finding the present value (how much is the loan now) from the final value (6 years later10.8 million yuan can be repaid at one time). The discount rate is 50% of the annual interest rate from 5 to 7 years, that is, 6.2 1%/2. The calculation formula is:

The power of PV = Fv/(1+r) =1.8/(1+6.21%/2) to the sixth power is about 1.5 million yuan.