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Answer

4 bags + 3 shoes ——-> 302
3 bags + 4 shoes ——-> 302 + 54 = 356
1 shoes – 1 bag ——-> 54
1 shoe ——-> 1 bag + 54

4 bags + 3 x (1 bag + 54) = 7 bags + 162 ——-> 302
1 bag ——-> (302 – 162)/7 = 20
or
3 bags + 4 x (1 bag + 54) = 7 bags + 216 ——-> 356
1 bag ——-> (356 + 216)/7 = 20

Ans : $20.

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