Answer:
Month 3!
Explanation:
Here, let us go through each part of the question step-by-step!
Month 1.) Kyle has $90 and Sylvia has $50
Month 2.) Kyle has $110 and Sylvia has $90
Month 3.) Kyle has $130 and Sylvia has $130
Woah, looks to me like those are equal values!
In month three they have both have $130!