how to answer the question a from this table? i need an exact way how to do it

Home Health, Inc., has come to Jane Ross for a yearly financial checkup. As a first step, Jane has prepared a complete set of ratios for fiscal years 2011 and 2012. She will use them to look for significant changes in the company's situation from one year to the next. Home Health, Inc. Financial Ratios Ratio 2011 2012 Current ratio 3.25 3.00 Quick ratio 2.50 2.20 Inventory turnover 12.80 10.30 Average collection period 42.6 days 31.4 days Total asset turnover 1.40 2.00 Debt ratio 0.45 0.62 Times interest earned ratio 4.00 3.85 Gross profit margin 68% 65% Operating profit margin 14% 16% Net profit margin 8.3% 8.1% Return on total assets 11.6% 16.2% Return on common equity 21.1% 42.6% Price/earnings ratio 10.7 9.8 Market/book ratio 1.40 1.25 a. To focus on the degree of change, calculate the year-to-year proportional change by subtracting the year 201 1 ratio from the year 2012 ratio, then dividing the difference by the year 2011 ratio. Multiply the result by 100. Preserve the positive or negative sign. The result is the percentage change in the ratio from 2011 to 2012. Calculate the proportional change for the ratios shown here