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contoh r :
r = 1/2, 1/4, 1/8, 2/3, 3/4
rumus
S≈ a / (1-r)
contoh 1
misal a = 20, r = 1/2
maka :
S = 20 / ( 1-1/2) = 20/(1/2) = 20 x 2 = 40
contoh 2
a = 30 , r = 1/4
s = 30 / (1-1/4) = 30 / (3/4) = 30 x 4/3= 40
contoh 3
a= 70
r=1/8
s = 70 / ( 1-1/8) = 70/ (7/8) = 70 x 8/7 = 80