Who feels a greater effect from the 10 percent sales tax mark or Julia? Why ?

Answer:
Mark
Explanation:
Mark makes less money than Julia ($25,000 versus $100,000) and since they both pay the same amount in sales tax, it will take more out of his salary than Julia's.
Answer:
Mark
Explanation:
Mark's salary is lower than J*'s, so any percentage over the value of objects purchased by Mark will have a greater impact on his finances than the objects purchased by J*, that is, Mark loses more money than J* when buying the same objects with the same tax rate, because his salary is lower.