Correct. Mr. Simpson tips at least 10% and at most 20% of the bill, meaning he'd like to tip at least $8 and at most $16. Mrs. Simpson tips at least 15% and at most 25% of the bill, meaning she'd like to tip at least $12 and at most $20. Any amount between (and including) $12 and $16 would make both Simpsons happy, so the correct inequality to graph is $12 $\displaystyle\le{d}\le\usepackage{cmbright}\Huge\$ $16.