The effective interest rate on the additional debt contemplated in the second loan 15%.
Interest on 80% LTV loan = $8,000,000 × 8% = $640,000
Interest on 70% LTV loan = $7,000,000 × 7%= $490,000
Extra interest on additional $1,000,000 loan = $640,000-$490,000 = $150,000.
Effective interest on additional debt
= Additional interest/ additional debt
= 150,000/ $1,000,000 = 15%.
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