Electoral Votes and the United States Election

270 electoral votes are needed to win the presidential election.  What are some different ways that the states' electoral votes could be combined to equal the 270 votes?

For example, using the chart of electoral votes by state some of the top states that would sum up to 270 include: California  55, Pennsylvania 20, New York 29, Florida 29, Michigan 16, Texas 38, Illinois 20, North Carolina  15, Georgia 16, Minnesota 10. Washington 12. and Wisconsin 10.  

The map of electoral votes state by state shows who's in the lead in each state going into election week.
What different combinations of electoral votes would give your candidate the 270 votes needed to win?
If you were running for president in which states would you want to spend your resources?

270 votes is what percent of the total 548 votes needed to win the election?