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The circuit shown below consists of a battery of negligible internal resistance and two resistors,
(${R}_{1}\text{ and } {R}_{2}=25 \text{ Ohms}$). The resistance of the connecting wires is also negligible.

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

Which of the following is closest to the $emf$ of the battery?


$7.5\text{ V}$


$13\text{ V}$


$20\text{ V}$


$33\text{ V}$

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