divide with awk

Dear,

i want to devide the first 4 values from a raw over the next 4 values like the following:

$1+$2+$3+$4 / $5+$6+$7+$8

using AWK ....can someone help me?

Sanks

awk '{ tmp=($1+$2+$3+$4)/($5+$6+$7+$8) ; printf"%0.2f\n", tmp }' yourinputfile