Moderate# This Battery Has Potential

APPH12-BO$DL3

The circuit shown below consists of a battery of negligible internal resistance and two resistors,

(${R}_{1}\text{ and } {R}_{2}=\text{25 Ohms}$). The resistance of the connecting wires is also negligible.

- The current leaving point X and going into the upper 'branch' (containing ${R}_{1}$) is 0.50 Amps.
- The current leaving point Y in the circuit is 0.80 Amps.

What is the $emf$ of the battery?