A has 4 chocolate, B has 8 chocolate, C has 16 chocolate, D has 32 chocolate, E..........,

Z has ...... chocolate

The chocolate of A + B + C + D + E + F + ... + Z = a

a*2-1000 = B

B*2-2000 = C

C*2-3000 = D

D*2-4000 = E

.....

J*5-(the answer) = 9089

ANSWER!