A battery with $\xi = 12.0 \textrm{ V}$ and internal resistance $r = 1.0 \; \Omega$ is connected to two $7.5$-$\textrm{k}\Omega$ resistors in series. An ammeter of internal resistance $0.50 \; \Omega$ measures the current, and at the same time a voltmeter with internal resistance $15 \textrm{ k}\Omega$ measures the voltage across one of the $7.5$-$\textrm{k}\Omega$ resistors in the circuit. What do the ammeter and voltmeter read? What is the % “error” from the current and voltage without meters?