A company purchased 110 units of $20 each on January 31. It purchased 200 units for $25 each on 28 February.it sold200 units for $50 each from 1 March to 31 December.if the company uses the first in ,first out inventory costing method,what is the amount of cost of sales on the income statement for the year ending 31 dec(assume that the company uses a perepvtusl inventory system