3000+2000*(p/a，8%， 1)=x*(p/a，8%，7)*(p/f，8%，3)

Looking up the table of present value and compound interest of annuity, it is concluded that: 3000+2000*0.925=x*5.206*0.793.

X = 1 1748000 yuan.

The construction unit will repay11748,000 yuan at the end of each year.

hope this helps