1) What is the assumption of cost structure?

2) Calculate contribution Margin

ABC Income Statement \begin{tabular}{l|r|r|r|} \hline & 2017 & 2018 \\ \hline REVENUE & 697,503,528 & 710,205,386 \\ \hline COST OF SALES & 297,179,735 & 274,942,979 \\ \hline GROSS PROFIT & 400,323,793 & 435,262,407 \\ \hline ADD: OTHER INCOME & 35,846,054 & 28,337,773 \\ \hline LESS: DISTRIBUTION EXPENSES & 39,478,886 & 25,154,006 \\ \hline LESS: ADMINISTRATIVE EXPENSES & 106,352,913 & 111,054,590 \\ \hline LESS: OTHER EXPENSES & 20,807 & 28,272 \\ \hline LESS: FINANCE COSTS & 4,800,516 & 7,072,315 \\ \hline PROFIT/(LOSS) BEFORE TAX & 285,516,725 & 320,290,997 \\ \hline INCOME TAX EXPENSE & 60,841,090 & 97,060,913,, \\ \hline PROFIT/(LOSS) FOR THE YEAR & 224,675,635 & 223,230,084 \\ \hline OTHER COMPREHENSIVE INCOME & & \\ \hline TOTAL COMPREHENSIVE INCOME/ (EXPENSE) FOR THE YEAR & & 224,675,635 & 223,230,084 \\ \hline & & 21,91 & 21,95 \\ \hline \end{tabular}