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Spot the error

This Swift code contains one error – can you select the line that is incorrect?

Tip: You should mentally run the code from top to bottom, meaning that if line 3 says an integer should be returned and line 10 tries to return a string, line 10 is the wrong one.

func calculateWorkload(employees: Int) -> String {
    var calculation = employees * 10_000
    if employees > 10 {
        calculation += 20_000
    }
    let str: Int = "The result is \(calculation)"
    return str
}
print(calculateWorkload(employees: 8))
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