Question 635933
Let M = income at Macys and
    D = income at Dillards and
    S = Sales in $
From the problem statement we have
    M = $20,000 + 7% S
    D = $25,000 + 5% S
In order for Macys income to exceed Dillards we have the inequality
    M > D or
    20,000 + 0.07S > 25,000 + 0.05S
Combining like terms we obtain
    (0.07-0.05)S > 25,000-20,000
     0.02S > 5,000
     S > 5,000/.02
     S > 250,000
Choose d, the sales associate should sell more than $250,000