4.1 A shop owner buys 300 calculators for R 104850 . He sells 180 calculators for R 1290 each and 120 calculators for 30% less. 4.1.1 Calculate the selling price per calculator. 2 marks 4.1.2 Calculate the gross profit if all 300 calculators are sold. 3 marks 4.2 Tyre Smart wants to make a 35% profit. Their cost per tyre is R480 and they give a trade discount of 10%. 4.2.1 Calculate the selling price per tyre if the retailer wants to make a profit of 35% after allowing a trade discount of 10%. 5 marks 4.4 A certain clothing store has a set mark-up percentage. They buy a container with 100 pairs of shoes for R9 600. They sell the shoes for R384 a pair. 4.3.1 What is the store's mark-up percentage? 3 marks 4.3.2 What do they have to sell a dress for if they buy 100 dresses for R 12000 ? 3 marks