Jawabanmu

2014-01-15T19:01:43+07:00
Sn = a(1-r^n)/1-r
=12 (1-1/2^5)/1-1/2
=12(1-1/32)per1/2
=12(31/32)per 1/2
=372/32 x 2/1
=23,25

trims