tolong donkk nomor 18 & 19 pakai caranya yg lengkap ya..karna bsok dikumpulkan..thx

No 18
Dik = - p = 12%
- b = Rp. 72.000,00'-
- n = 9 bulan
Dit = M?
Jawab
B = M.P.N/12x100
72000 = M.12%.9/12x100
72000 = M.9/100
9M = 72000
100 1

9M = 7200000
M = 800000

No 19
Dik = - M = Rp600.000,00'-
- M.akhir = Rp744.000,00'-
- p = 16%
Dit = n?
Jawab
B = M.akhir - M
= 744000 - 600000
= 144000

144000 = 600000.16%.n/12x100
144000 = 6000.4%.n/3
144000 = 2000.4n
8000n = 144000
n = 18 bulan

Semoga aja benar :D