(a) Find the current I in the circuit of Figure (a).
(b) An ammeter with an internal resistance of 1 \Omega is inserted in the network to measure {I}^{\prime} as shown in Figure (b). What is {I}^{\prime}?
(c) Calculate the percent error introduced by the meter as
\left| \frac {I- {I}^{\prime} }{ I} \right| \times 100 %