Percentages, SM-Bank 034 MC

Hoon's camera has a memory card that holds 20 gigabytes.

He has used exactly 16 gigabytes of memory.

What percentage of the memory has not been used?

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\(B\)

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\(\text{Memory left}\)	\(= 20-16\)
	\(= 4\ \text{GB}\)

\(\therefore\ \text{Percentage not used}\)

\(=\dfrac{4}{20}\)

\(= 20\text{%}\)

\(\Rightarrow B\)