IL_{1} = 10 log (I_{1}/I_{0})
IL_{2} = 10 log (I_{2}/I_{0})
IL_{1}  IL_{2} = 10 log [(I_{1}/I_{0})

(I_{2}/I_{0})]
= 10 log (I_{1}/I_{2}) {Remember the difference of
logs is the log of the quotient}
105 = 10 log (I_{1}/I_{2})
log (I_{1}/I_{2}) = 10.5
(I_{1}/I_{2}) = 3.2X 10^{10}
Return to Self Test 4