As the problem is written i think that P(D/F) and P(D/W) are independent
P(D/FUD/W)=P(D/F)+P(D/W)-P(D/F)*P(D/W)=O,1+0,25-O,1*0,25=0,35-O,O25=0,325
Now i think that it might be the solution.Is it right?Do you mean that the P(F1)=0,3 and P(F2) are not need to solve the problem?