| 8 | 1 28 1 31 | | | | | | 300 % | | 2 | 1 2 4 | | | | | 200 % | | | · = ÷ | 300 % | · = ÷ | 200 % | · = 365 － 104 ÷ 12 | = 21.75 | 5000 | = 5000 ÷ 21.75 300 % ≈689.66 | | = 5000 ÷ 21 . 75 200 %≈ 459.77 | | 8 689.66 | 4 + 459.77 4 = 4597.72 | | |