1. The problem involves converting actual units sold into bar graph units using the scale 1 unit = 300 units sold. 2. For Product B, units sold = 3000. Using the scale, unit height = $\frac{3000}{300} = 10$ units. 3. Highest sales: Product A with 4500 units, lowest sales: Product D with 2400 units. Difference in units sold = $4500 - 2400 = 2100$ units. Difference in bar heights = $\frac{2100}{300} = 7$ units. 4. Product E units sold = 2700. Product F units sold = $2700 + 600 = 3300$ (not needed for the answer but given). Unit height for Product E = $\frac{2700}{300} = 9$ units. Final answers: (i) 10 units (ii) 7 units (iii) 9 units