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b = 3p
2b + 4p = 15000
maka
2b + 4p = 15000
2(3p) + 4p = 15000
6p + 4p = 15000
10p = 15000
p = 1500
maka
buku = 3p = 3(1500) = 4500
bisa ditanyakan apabila kurang jelas :)