Tolong jawab no. 23 kk...

a = 100.000
b = 50.000
n = 10 bulan

jumlah = 1/2 n (2a + (n-1)b)
           = [tex] \frac{1}{2} [/tex](10)  (2(100.000) + (10-1) (50.000))
           = 5 (650.000)
           = 3.250.000