What is 45% of 25% of 4/5 th of 850 ?

Answer: Option C

Given expression :
$$\begin{array}{rl}& =\left(\frac{45}{100}\times \frac{25}{100}\times \frac{4}{5}\times 850\right)\\ & =\frac{153}{2}\\ & =76.5\end{array}$$