3. Astrid's business for the year ending 31 March 2021 has the following totals relevant to sales and purchases: Sales . Purchases Sales returns . Purchases returns 983 007 668 450 15 266 28 289 Opening stock was 65 442 and closing stock was 72 320. What was the Gross Profit for the year? a) 334 458 b) 321 435 c) 308 412 d) 364 990