If $$33\frac{3}{5}%$$ of $$29\frac{3}{4}$$ of $$'x'$$ is 357, then $$x =$$

A

$$\frac{1500}{7}$$

B

$$\frac{20000}{7}$$

C

$$\frac{25600}{7}$$

D

$$\frac{30000}{7}$$