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\documentclass[11pt]{article}\usepackage{graphicx,latexsym,amsfonts,amssymb,amsmath,verbatim,theapa,lscape, multirow,xcolor, booktabs, upgreek, caption}\begin{document}Similarly, the competitive marginal offers [\begin{math}\left({{\rm{start \!-\!up \;fee}} + {\rm{price \;per \;unit}} \times{\rm{2}}} \right) \div 2 \end{math}] would have to be 20 during theoff-peak periods, 172 during the peak periods and 93 during theshoulder 2 periods.\end{document}