Thandi starts a new business baking pies that she sells to a local Spaza shop. She uses the family kitchen to bake her pies. Thandi used this formula to calculate her profit: Profit = money received for sales - cost of ingredients Her profits are shown in the table. Week Number of pies sold Profit 1 2 3 4 5 25 34 39 42 40 R75 R102 R117 R126 R120 a) Write Thandi's profit per pie as a rate. (1)