4 months. The reason I say why is because the first one is 115$ with 30$ for the first month 145$. Then take 1 month for the second plan 60$. Take 2 months for the first plan to make it 175$. The same with the second, 120. Again with the first, 205$. The same with the second. 180$. For the last or 4th month, the first one is 235$, and the second one is 240$. I hope this helps :)