(38*652+35*721)*0.8
$$\left({\mathtt{38}}{\mathtt{\,\times\,}}{\mathtt{652}}{\mathtt{\,\small\textbf+\,}}{\mathtt{35}}{\mathtt{\,\times\,}}{\mathtt{721}}\right){\mathtt{\,\times\,}}{\mathtt{0.8}} = {\mathtt{40\,008.8}}$$