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B = A +500
5A + 3(A+500) = 3000
8
5A +3A +1.500 = 3000
8
8A +1500 = 24000
8A = 24000 - 1500
8A = 22500
A = 22500 / 8
A = 2812,5
jenis b = y
b= a + 500
(a+b)/2 = 3.000
a+ b = 3000 x 2
a + b = 6000
disubstitusi
a + b = 6.000
a + a + 500 = 6.000
2a = 6.000 - 500
2a = 5.500
a = 2750----> harga beras a