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:
World Price
The international market price of a good or service, determined by global supply and demand conditions.
Consumer Surplus
The difference between the total amount consumers are willing and able to pay for a good or service and the total amount they actually pay.
Equilibrium
A state in which market supply and demand balance each other, and as a result, prices become stable.
Market
A venue or mechanism where buyers and sellers come together to exchange goods, services, or information.
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