1. Subtract the cost from the selling price: 9.55 - 5.55 = 4.00
2. Divide the difference by the cost: \frac{4.00}{5.55} \approx 0.7207
3. Multiply by 100 to get the percentage: 0.7207 \times 100 \% \approx 72.07 \%
Answer: 72.07 \%
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