The element X has three naturally occurring isotopes.The masses (amu) and % abundances of the isotopes are given in the table below.The average atomic mass of the element is ________ amu. 
Definitions:
Total Output
Total output refers to the total quantity of goods and services produced within an economy at a given time period, reflecting the aggregate production level.
Comparative Advantage
The ability of a country, individual, company, or region to produce a good or service at a lower opportunity cost than its competitors.
International Trade
The movement of goods and services across national boundaries or territories for trade purposes.
Heckscher-Ohlin Model
An economic theory that proposes that countries will export goods that make intensive use of the factors of production that they have in abundance.
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