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6 bags ——-> 3/5 (of her money)
12 bags ——-> 6/5
$180 + 1 bag ——-> 2/5
$540 + 3 bags ——-> 6/5
12 bags ——-> $540 + 3 bags
1 bag ——-> $[540/(12 – 3)] = $60
$180 + 7 bags ——-> $(180 + 7 x 60) = $600

Ans : $600.

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