Finding percentage from a chart

An analyst researches the relationship between different energy sources in each state for 2015.  The data in the table show the number of states that use coal and nuclear power as an energy source.

Given that a state does not use nuclear power, what percentage of those states use coal?

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There are 32 states that do not use nuclear power  (20 + 12).

Out of those states 20 use coal and 12 do not.

The percentage of the states not using nuclear power, but using coal is:

20
----   {amount using coal over total amount}
32

=  0.625   {divided}

=  62.5%   {changed decimal to percent by moving decimal point two places to the right}

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