Answer:
Lees have lower weekly rental cost.
Explanation:
Consider the total rent of both are same.
Formula for weekly rental cost is

Weekly rental cost is inversely proportional to number of week. It means, more number of weeks represents less rental cost.
It is given that lees rented a car for 4 weeks and santos rented a car for 2 weeks.
Number of weeks of lees is more than the number of weeks of santos.
Hence, lees have lower weekly rental cost.