Appreciate if anybody can help me on the below request.

B4 has a fixed amount of 50000

B6, B7, B8€¦. downwards will have various figures (ex. 50000, 40000, 35000)

E6, E7, E8€¦. downwards can have 500, 250 or 0

I want a formula in f6 to check if E6 is 500 then check B6 is greater than
85% of B4 if yes E6 multiply by 2 if not 0. If E6 is 250 then check B6 is
greater than 80% of B4 if yes E6 multiply by 2 if not 0. If E6 is 0 then F6
is 0.