A company purchased $100$ units for $$20$ each on January $31.$ It purchased $100$ units for $$30$ on February $28,$ It sold a total of $150$ units for $$45$ each from March $1$ through December $31.$If the company uses the last$-$in$,$ first$-$out $($LIFO$)$ inventory costing method, calculate the amount of Cost of goods aold on the income statemebt