Answer:
Chuck must be less than $260,000
Step-by-step explanation:
The economic decision rule is: Do it if that marginal benefit exceeds the marginal cost and Since Chuck was unwilling to purchase the house at $260,000, we can deduce that the marginal benefit of purchasing the house must be less than $260,000 due to the fact that the seller turns down the offer but says she will sell the house for $260,000.