Answer:
Queensland 14.7%
New South Wales is 24.0%
Explanation:
This is a case of modified  return on investment since the question was specific that the  return on investment  should in terms margin and assets turnover.
The first task would be to compute margin and turnover  whereas the return on investment  would be  the multiples of both performance measures.
Margin =operating income/sales
Asset turnover=sales/average operating assets
operating income/sales*sales/average operating assets=operating income/average assets 
This question also require proofing the above formula as I have done.
                                  Margin                  Assets turnover                      ROI
Queensland$82,320/$784,000=10.5%$784,000/$560,000=1.4     14.7%
South Wales$118,800/$1,485,000=8% $1,485,000/$495,000=         24.0%
R0I=margin*assets turnover
Queensland=10.5%*1.4=14.7%
New south sales=8%*3=24%