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? Let's answer step by step:
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. The answer: 15.