A bank has an average asset duration of 4.2 years and an average liability duration of 2.4 years. This bank has total assets of $650 million and total liabilities of $420 million. Currently, market interest rates are 7 percent. If interest rates fall by 1 percent (to 6 percent), what is this bank's change in net worth?

Can you please show your work so I can understand? Thank You! :-)