Answer: 3.75 Riyals / USD
Step-by-step explanation:
The Real Exchange rate is different from the Nominal exchange rate as it takes into account, the differences between the 2 nations being compared in terms of prices of goods and services.
As such it can be used to calculate the Nominal rate;
Real Exchange Rate = (Cost in U.S. x Nominal Exchange Rate) / Cost in Saudi Arabia
2/3 = (10 x Nominal Exchange Rate) / 56.25
2/3 x 56.25 = 10 x Nominal Exchange Rate
10 x Nominal Exchange Rate = 37.50
Nominal Exchange Rate = 37.50 / 10
Nominal Exchange Rate = 3.75 Riyals / USD
The nominal exchange rate is 3.75 Riyals for every $1.