Jane has saved 75% of the radio cost
Percentage can be described as a fraction out of an amount that is usually expressed as a number out of hundred. Percentage is a measure of frequency.
The radio Jane wants to purchase costs $20 but she has saved only $15. The fraction of the amount Jane has saved to the total cost of the radio is [tex]\frac{15}{20}[/tex]. This fraction would have to multiplied by 100 to convert it to a percentage.
Percentage of the radio cost she has saved = (amount Jane has saved / cost of the radio) x 100
[tex]\frac{15}{20}[/tex] x 100 = 75%
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