The 25Ohm resistor R is connected across a battery whose EMF

The 25-Ohm resistor R is connected across a battery whose EMF epsilon is 12 V and whose internal resistance r = 5 Ohm. What is the ratio of the power dissipated in resistor r to the power dissipated in resistor R? 1.0 2.0 0.8 0.4 0.2

POWER DISSIPATED IN RESISTOR r / POWER DISSIPATED IN RESISTOR R (Pr/PR).

Pr/PR=5/25=1/5=0.2