Question 28793
LOG (1000)= 3 SINCE 10^3=1000...THIS CAN ALSO BE OBTAINED AS 
LOG(1000)=LOG(10*100)=LOG(10)+LOG(100)=1+2=3 SINCE 10^1=10 AND 10^2=100
IN GENERAL BY USING Z FOR 1000 ,X FOR 10 AND Y FOR 100, WE COCLUDE THAT 
LOG(Z)=LOG(X*Y)=LOG(X)+LOG(Y)..THIS READ AS LOG OF A PRODUCT (Z HERE ...OF 2 NUMBERS OR MORE) IS EQUAL TO SUM OF THE LOGS OF THE FACTORS.(X & Y HERE..OR MORE..)
BY PRODUCT OF LOGS WE MEAN 
LOG(10)*LOG(100)=1*2=2..
THERE IS NO FORMULA FOR THIS.YOU HAVE TO FIND THE LOGS SEPERATELY AND MULTIPLY.