Answer:
Your friend left the bigger tip.
Explanation:
We have to first find how much you tipped the waiter, 15%.
15% of 15.85 is 2.4. So, you tipped the waiter $2.40 (about)
Your friend leaves a 20% tip, so we have to also find 20% of $14.30
20% of 14.30 is 2.86. So your friend tipped $2.86 to the waiter.
Your friend left the bigger tip.