To help Sanji evaluate whether purchasing a premium membership is worth it, we can set up a simple comparison of costs based on his food purchases.
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Calculate Shipping Costs Without Membership:
- If Sanji buys items worth \( X \) dollars, the shipping cost without the premium membership would be: \[ \text{Shipping Cost} = 0.03 \times X \]
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Cost with Membership:
- With the premium membership, Sanji pays a flat yearly fee of $45, and the shipping is free.
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Determine the Break-Even Point:
- We need to find out when the shipping costs without membership equal the membership cost: \[ 0.03 \times X = 45 \]
- Solving for \( X \): \[ X = \frac{45}{0.03} = 1500 \]
This means that if Sanji spends more than $1500 on health food in a year, it would be more cost-effective for him to buy the premium membership. If he spends less than $1500, he is better off without the membership.