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8000 : 100 = 80
80 x Rp 450 = Rp 36.000 (b)
19. 420.000/ 360.000
= 1 1/6 (a)
20. 50 : 10 = 5
l = 8 x 5 = 40 m
t = 6 x 5 = 30 m
40 m dan 30 m (d)