Plot a graph showing the greatest year-on-year percentage change for each company.

Steps to Solve

1. Calculate Year-on-Year Changes for Each Company

For each company, calculate the year-on-year percentage change using the formula:

$$ \text{Percentage Change} = \left( \frac{\text{Profit in current year} - \text{Profit in previous year}}{\text{Profit in previous year}} \right) \times 100 $$

2. Conduct Calculations for Each Company

   • Company A:

     • From Year 1 to Year 2: $$ \frac{533 - 520}{520} \times 100 = 2.5% $$

     • From Year 2 to Year 3: $$ \frac{544 - 533}{533} \times 100 = 2.06% $$

     • From Year 3 to Year 4: $$ \frac{531 - 544}{544} \times 100 = -2.39% $$

     • Greatest Change: $2.5%$

   • Company B:

     • From Year 1 to Year 2: $$ \frac{338 - 350}{350} \times 100 = -3.43% $$

     • From Year 2 to Year 3: $$ \frac{325 - 338}{338} \times 100 = -3.84% $$

     • From Year 3 to Year 4: $$ \frac{312 - 325}{325} \times 100 = -4.00% $$

     • Greatest Change: $-3.43%$

   • Company C:

     • From Year 1 to Year 2: $$ \frac{600 - 620}{620} \times 100 = -3.23% $$

     • From Year 2 to Year 3: $$ \frac{579 - 600}{600} \times 100 = -3.50% $$

     • From Year 3 to Year 4: $$ \frac{599 - 579}{579} \times 100 = 3.45% $$

     • Greatest Change: $3.45%$

   • Company D:

     • From Year 1 to Year 2: $$ \frac{401 - 398}{398} \times 100 = 0.75% $$

     • From Year 2 to Year 3: $$ \frac{402 - 401}{401} \times 100 = 0.25% $$

     • From Year 3 to Year 4: $$ \frac{406 - 402}{402} \times 100 = 0.99% $$

     • Greatest Change: $0.75%$

3. Identify Overall Greatest Year-on-Year Percentage Changes

   • Company A: $2.5%$
   • Company B: $-3.43%$
   • Company C: $3.45%$
   • Company D: $0.75%$

4. Prepare Data for Graph

Create a dataset for plotting:

5. Plot the Graph

Using a bar graph, plot the 'Company' on the x-axis and 'Greatest Percentage Change' on the y-axis.