What is the value of $$\frac{1}{2} of \frac{16}{5} + \frac{1}{8}  of \frac{24}{9} \times \frac{18}{12} - \frac{5}{8}$$?

A

$$\frac{51}{40}$$

B

$$\frac{68}{39}$$

C

$$\frac{59}{40}$$

D

$$\frac{61}{50}$$