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Lama menabung = Suku bunga × 12 : ( Modal × bunga% : 100 )
= Rp 72.000 × 12 : ( Rp 800.000 × 12% : 100 )
= Rp 864.000 : Rp 96.000
= 9 bulan
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10).
U₃ = 12
12 = a + 2b
U₆ = 96
96 = a + 5b
Eliminasikan :
a + 2b = 12
a + 5b = 96 -
-3b = -84
b = 28
Substitusikan :
a + 2b = 12
a + 56 = 12
a = -44
Maka, S₁₀ :
Sn = 1/2 × n ( a + ( a + ( n - 1 ) b ) )
S₁₀ = 1/2 × 10 ( -44 + ( -44 + ( 10 - 1 ) 28 ) )
S₁₀ = 5 ( -44 + ( -44 + 9 × 28 ) )
S₁₀ = 5 ( -44 + 208 )
S₁₀ = 5 × 164
S₁₀ = 820