Answer Happy

Please include formula. Thanks!
In the circuit below, the emf's and the resistances have the values shown (0.312, 0.2 and 1,50) 12 V 0.3 Ω 6 V 0.252 X 150 Y R The current in the circuit is 2 amperes. The potential difference between points X and Y is Select one: 1.2 V 10.8 V O 6.0 V 8.4 V The correct answer is: 8.4 V