We use the Du-Pont equation here
As per Du-pont equation
ROE = profit margin * total asset turnover * Equity multiplier
Given, ROE = 20.34% = 0.2034
Profit margin = 5.8% = 0.058
Total asset turnover = 1.7
0.2034 = 0.058*1.7*Equity Multiplier
Equity Multiplier = 0.2034/(0.058*1.7) = 2.06288
Equity Multiplier = 1 + debt-equity ratio
2.06288 = 1+ debt equity ratio
debt-equity ratio = 2.06288 -1 = 1.06288
debt-equity ratio = 1.06 (Rounded to 2 decimals)