Question

Which scenario starts with a linear pattern that eventually becomes non-linear?

Scenario 1: : Mario uses 30 minutes every day of the 400 minutes he is allotted on his monthly pre-paid cell phone plan.
Scenario 2: Mario gets paid $3,750 per month. He invests 25% of his salary in company stock, until he reaches the limit of $10,000 per year. Mario then invests 10% in gold.