The value of 3340 + 1/5 [ 4/5 - 1/5 × ( 7/8 - 5/4 ) ] is:

Answer: Option D

$$\begin{array}{rl}& \frac{33}{40}+\frac{1}{5}\left[\frac{4}{5}-\frac{1}{5}\times \left(\frac{7}{8}-\frac{5}{4}\right)\right]\\ & =\frac{33}{40}+\frac{1}{5}\left[\frac{4}{5}-\frac{1}{5}\times \left(\frac{7-10}{8}\right)\right]\\ & =\frac{33}{40}+\frac{1}{5}\left[\frac{4}{5}+\frac{1}{5}\times \frac{3}{8}\right]\\ & =\frac{33}{40}+\frac{1}{5}\left[\frac{4}{5}+\frac{3}{40}\right]\\ & =\frac{33}{40}+\frac{1}{5}\left[\frac{32+3}{40}\right]\\ & =\frac{33}{40}+\frac{7}{40}\\ & =\frac{40}{40}\\ & =1\end{array}$$