To determine how many additional bottles of shampoo Mark should order, we first need to calculate how many bottles he currently has.
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Full boxes of shampoo: He has 2 boxes of 96 bottles each. \[ 2 \times 96 = 192 \text{ bottles} \]
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Open box: He also has 26 bottles in an open box. \[ 26 \text{ bottles} \]
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Total bottles currently available: \[ 192 + 26 = 218 \text{ bottles} \]
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Target amount: Mark wants to have 250 bottles in storage.
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Bottles needed: To find out how many more bottles he needs to order, subtract the total he currently has from his target amount. \[ 250 - 218 = 32 \text{ bottles} \]
Therefore, Mark should order 32 bottles of shampoo.