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S∞ =
=
=
= 10 x
= 12
rasio = 2/10 = 1/5
S~ = a/(1-r)
S~ = 10/(1-1/5)
S~ = 10/(4/5)
S~ = 10 : 4/5
S~ = 10 X 5/4
S~ = 50/4
S~ = 12,5