stock options question?

["RB" <rhodes@xxxxxxxxxxxxxx>]

I know that there is no right answer, because of volatility, time value and 
many other things, but I was wondering in a general way, on average, what is 
the leverage considered for at the money options compared to the stock?
In other words, if a stock, say goes up 10% what would the at the money 
call option value go up?   Just a close, general, on average idea will do.

Thanks,