Suppose A and B are 10 x 10 matrices such that det (A) = 4 and det (B) = 5. The matrix Cis obtained by exchanging rows 5 and 7 of A, then scaling row 9 by 3. The matrix D is obtained by exchanging columns 1 and 3 of B, then rows 6 and 7, then scaling the entire matrix by 2. What is the determinant of A-¹ BC-¹D? -