One riyal is equal to how many dollars?

What is the substitute economics definition and how does it impact consumer behavior in the market? What is a hidden production function? Why are different economic theories needed to make microeconomic and macroeconomic decisions? Can total utility be zero? How much is 250 quid in us dollars? Which country has had the maximum relative decline in its share of world output since 1963? When will the stimulus checks be disbursed for the year 2010? Why is there a shortage of insulin? In two ways could goods be transported from Buffalo toToledo? Has the US made good use of its social capital to increase workplace inclusion. Why or why not? Bad effects to mining? How do real estate business make their money? What is the most effective mix strategy for optimizing marketing campaigns? Who is responsible for law of diminishing returns? What happens after a firm increases the quantity produced? What is meant by surplus and deficit? In what ways did the English Industrial Revolution contribute to ideas of laissez faire and free trade? What is the value of a 1973 100 Mexican pesos bill? When a country's central bank increases the money supply a unit of money? What are differences between keynesian and classical theories on demand for money?