One 13-year-old girl was raped and then murdered. One woman was raped, murdered, and set on fire after being doused with gasoline. Another woman was raped and murders. Four other women were raped but not murdered.
For the girl, the guy received 25 to life.
For the other 2 women, he received 75 years total.
For the 4 women who survived, he received 425 years total.
It doesn't make sense that rape and murder would get a lesser sentence that rape alone.
		
		
	 
Oh, I see what you mean.  The defendant doesn't get sentenced for both rape and murder.  Per attack/incident/victim, he will only be sentenced for the higher crime (the highest crime that he's convicted of).  We don't add up all the offenses. and say the rape is worth 2 yrs, the murder is worth 5 yrs, and so on.
 For example, for let's say the defendant found a woman to attack, he fucked her at gun point, took all of her money, and shot her in the head which killed her immediately, he sole her car, and sped down the highway.  Now, he'll be charged w/ grand theft auto, (forget the speeding charge), armed robbery, rape, aggravated assault, aggravated battery, murder, and some other things.  The jury can convict him of any and all of these charges depending on the evidence and depending on whether or not they believe, beyond a reasonable doubt, that he is guilty of these crimes.  
However, when it comes to sentencing, he'll only be sentenced for murder.  Why?  B/c the violent crimes are all lumped together b/c they occurred out of the same incident.  
Now, if this defendant had stopped at a gas station and attacked another person, and assuming he was convicted of the attack, then he could be sentenced for that second crime as well (different people, and different incident).
Also, if he had cheated on his taxes earlier in the day, or joined some illegal betting scheme, then that would also be far game in sentencing b/c the crimes are different (non-violent).  
So, in your example, the guy got 25 to life for rape and murder of one girl.  The 25 yrs is really for the murder.  The murder was the worst he did that day to that girl.
The man got 425 for four rapes.  That's 4 women times 4 rape incidents, which is where the number comes from.  
Does this answer your question?