Adding existing set of records in the same file

Shell Programming and Scripting
1

I have a file with 50,000 records in it, i have a requirement to use the same 50,000 records and add them 4 times to the same file to make a total of 200,000 records. I was wondering how to do this using ksh. Any help is greatly appreciated.

2 
#!/bin/ksh
for i in 1 2 3 4
do
    cat file >> temp
done
mv temp file
3 
while read LINE
do
        echo "$LINE"
        echo "$LINE"
        echo "$LINE"
        echo "$LINE"
done < infile > outfile