How to in calculate percentages in swift?

We can calculate percentage in swift as below:

//Calucate percentage based on given values
public func calculatePercentage(value:Double,percentageVal:Double)->Double{
    let val = value * percentageVal
    return val / 100.0
}

We can use this function like:

let value = calculatePercentage(value: 500,percentageVal: 20)
 print(value)

Output will be:

100

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