Please show formula and calculation

A bank has the following asset and liability portfolios. What is the gap ratio? Rate-Sensitive Amount Rate-Sensitive Amount Assets (in millions) Liabilities (in millions) Floating-rate $4,000 NOW accounts $1.750 oans Floating-rate mortgages 1,000 MMDAs 4,500 Short-term reasury securities 1500 Short-term CDs 1.000 $6,500 $7,250 A) $750 million B) -$750 million C) 1.12 D) .896