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16.sepasang sepatu = 30% lebih mahal
sepasang sandal = 75.000
harga sepasang sepatu = ?
75.000 × 30/100
= 750 × 30
= 22.500
75.000 + 22.500
= 97.500 (harga sepasang sepatu)
Jadi, harga sepasang sepatu adalah Rp. 97.500,-
17.
47 : 13 = 3,61
18. himpunan bilangan prima antar 10 sampai 20 = {11, 13, 17, 19}
19. {1, 3, 5, 7, 9, 11, 13} adalah himpunan bilangan ganjil.
20.
A = {y | -2 < y < 15} y adalah bilangan bulat genap, maka n (A) =
n(A) = {2, 4, 6, 8, 10, 12, 14}