Trying to get query to work

Hello All,
I apologize if I'm posting to the wrong place, if I should be
posting somewhere else, I would appreciate it if someone would let me
know, and accept my advance apologies. I have a table that looks like this:

id | model | make | color | count
-------------------------------------------------
1 | Toyota | Corolla | Blue | 3
2 | Toyota | Corolla | Red | 2
3 | Dodge | Avenger | Black | 1
4 | Dodge | Avenger | Red | 5
6 | Chrysler | Sebring | Beige | 8

I need to create a SQL statement that will give me results that look
like this:

model | make | color | count | total |
percentage
------------------------------------------------------------
Toyota | Corolla | Blue | 3 | 5 | 60%
Toyota | Corolla | Red | 2 | 5 | 40%
Dodge | Avenger | Black | 1 | 6 | 17%
Dodge | Avenger | Red | 5 | 6 | 83%
Chrysler | Sebring | Beige | 8 | 8 | 100%

This is the closest that I've come so far:
SELECT model, make, color, SUM(count) AS total, ((count/SUM(count))*100)
AS percentage FROM autos GROUP BY model, make, color, count;

However this produces a table that looks like this:
model | make | color | count | total |
percentage
------------------------------------------------------------
Toyota | Corolla | Blue | 3 | 3 | 100%
Toyota | Corolla | Red | 2 | 2 | 100%
Dodge | Avenger | Black | 1 | 1 | 100%
Dodge | Avenger | Red | 5 | 5 | 100%
Chrysler | Sebring | Beige | 8 | 8 | 100%