To compare EMF of two cells using potentiometer the balancing lengths obtained are \( 200 \, \text{cm} \) and \( 150 \, \text{cm} \). The least count of scale is \( 1 \, \text{cm} \). The percentage error in the ratio of EMFs is ______.
\( 1.45 \)
\( 1.65 \)
\( 1.55 \)
\( 1.75 \)
