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11x3=33
12x9=108
13x4=52
14x3 =42
15x1=15
jumlah semua 250: 20
=12,5
36.= (11×3)+(12×9)+(13×4)+(14×3)+(15×1)
= 33+108+52+42+15=250
=250÷20=12.5
=B jawabannya