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Verified answer
Permen A = xPermen B = y
4x + 3y = 2.500
2x + 7y = 2.900
[4x + 3y = 2.500]× 7
[2x + 7y = 2.900]× 3
28x + 21y = 17.500
6x + 21y = 8.700
_____________—
22x = 8.800
x = 400
2x + 7y = 2.900
800 + 7y = 2.900
7y = 2.900 - 800
7y = 2.100
y = 300
1 lusin = 12 buah
24x + 48y
= 24 × 400 + 48 × 300
= 9.600 + 14.400
= Rp.24.000
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