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3 x 7500 = 5 donat
5 donat = 22500
1 donat = 4500
jika 1 roti = 7500
maka 3 buah roti = 3 x 7500 = 22500
3 roti = 5 donat
22500 = 5 donat
jadi harga 1 donat =
22500/ 5
= 4500