If I remember correctly, it should be technical economics.

1 I use the formula of equal payment from sinking fund.

When I = 6%, F (A/F, I, n) = 0.1774 * 200,000 = 35,480 yuan/year in five years.

The second is "equal payment capital recovery formula"

That is, p (a/p, I, n) = 0.2013 * 200,000 = 40,260 yuan/year.

3 1.2 million here should be regarded as F, right?

I won't go into details ~ f (a/f, I, n) = 0.1363 *120000 =16356 yuan/year ~