Answer:
Delta is responsible for insuring $200,000 / $1,600,000 = 1/8 of the building
Eversafe is responsible for 1 - 1/8 = 7/8
the loss = $1,600,000 x 40% = $640,000
Delta will pay 1/8 x $640,000 = $80,000
Eversafe will pay $640,000 - $80,000 = $560,000
in order for Eversafe to pay: