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a( 1 +r) / a r² ( 1 + r) = 9/4 ( garis bawah coret)
1 / r² = 9/4
r² =4/9
r = 2/3
a ( 1 +r) =45
a( 5/3) = 45
a = 27
S = a / (1-r)
= 27 / (1- 2/3)
= 27 / ( 1/3)
= 27 x 3
= 81