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*
*
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=(16x60)+(12x70)+(8x80)+(4x90)
=960+840+640+360
=
=70
15. # 15 x 48,8 = 732
# 5 x 52 = 260
# 6 x 48 = 288
732-260-288=184
Rata2 4 bilangan terakhir=