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The following inventory was available for sale during the year for Dolphin Tools: Beginning inventory 10 units at $120 First purchase 15 units at $165 Second purchase 30 units at $210 Third purchase 20 units at $195 Dolphin Tools has 25 units on hand at the end of the year. What is the dollar amount of inventory at the end of the year according to the first-in, first-out method?a. $6,600.b. $11,900.c. $6,300.d. $7,800.