Matilda bought a smartphone for $300. Then she decided she wouldn't use it anyway and sold it for $255. What percentage of the initial cost did she lose?
Please answer and provide answer explanation.
15
The difference between the initial cost and the amount she sold the phone for is $300 - $255 = $45.

$45 is (($45 / $300) * 100)% = 15% of $300.

.

So, the answer is 15