A bank has Federal Funds totaling $25 million with an interest-rate sensitivity weight of 1.0. This bank also has loans of $105 million and investments of $65 million with interest rate sensitivity weights of 1.40 and 1.15 respectively. It also has $135 million in interest-bearing deposits with an interest rate sensitivity weight of 0.90 and other money market borrowings of $75 million with an interest rate sensitivity weight of 1.0. What is the dollar interest-sensitive gap for this bank?

why is the answer -15 million? Please show work