To find out which fish Sasha bought, we can calculate the total cost for each type of fish per pound and see which matches the conditions given (34 lb of fish for a total cost of $5.40).
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Salmon: $9.60 per pound \[ \text{Total cost for 34 lb} = 34 \times 9.60 = 326.40 \]
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Whitefish: $7.20 per pound \[ \text{Total cost for 34 lb} = 34 \times 7.20 = 244.80 \]
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Swordfish: $8.40 per pound \[ \text{Total cost for 34 lb} = 34 \times 8.40 = 352.80 \]
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Haddock: $6.90 per pound \[ \text{Total cost for 34 lb} = 34 \times 6.90 = 234.60 \]
Upon review of the calculations, it seems none of the typical price calculations match Sasha’s total of $5.40 for 34 lb of fish. There's a misunderstanding here; each type of fish cannot be bought at those prices for 34 lb collectively for just $5.40; therefore, we need to reconsider the scenario. It appears there may be a mix-up in providing the problem parameters regarding the total weight and price.
Please double-check the figures relevant to the amount spent to help find a more suitable fit.