商品折扣最大值计算 - 解题步骤与答案解析

翻译：Solution: Let's assume that the discount rate for the product is x%.

According to the given conditions, we have the inequality: $550 \times \frac{x}{100} - 400 \geq 400 \times 10%$$.

Solving this inequality, we get $x \geq 8$$.

Therefore, the maximum discount rate that can be offered is 8%.

So, the correct answer is C.