Isaac drove 54.0985 km to visit his grandmother. When he reached his grandmother's house he noticed that the car had used up 4.21 liters of petrol. How many kilometers did he travel per liter of petrol?
Aaron's income is 30% less than Daniel's income, Nur's income is 30% less than Aaron's income, and Gabrielle's income is 40% less than Aaron's income. Daniel gave 50% of his income to Nur and 50% of his income to Gabrielle, Nur's new income would be what fraction of Gabrielle's new income?