To calculate real GDP, _____. Question 9 options: multiply the quantities of final goods and services produced in an economy in a year by their prices in a base year and then sum the values multiply the quantities and prices of final goods and services produced in an economy in a year by their prices in that year and then sum the values sum the quantities of all final goods and services produced in an economy in a year multiply the quantities of all goods and service produced in an economy in a year by their price in that year and then total the result