1kg costs £1.28. what is the cost of 250g
First, convert 1 kg to g.1 kg = 1000 gSo 1000 g = 1.28Set up a proportion:1000/1.28 = 250/xCross multiply:1000x = 320Divide 1000 to both sides:x = 0.32So 250g costs £0.32