c. 27 40.5
Step 1 is "read and understand the problem." Step 2 is "read the answer choices."
To choose the correct answer here, you only need to know that exponential growth functions are non-decreasing. The next y-values cannot be smaller than the values already shown.
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If you insist on doing some calculation, ...
Comparing adjacent values, you see that the common ratio is 3/2.