Apple Game Frameworks and Technologies: 50 + and 60 * (?)

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Title: Apple Game Frameworks and Technologies: 50 + and 60 * (???) (page 143)

Is this intentional? lowerLimit adds 50, but upper limit multiples by 60??

let randomModifier=SKRange(lowerLimit:50+CGFloat(level),
                           upperLimit:60*CGFloat(level))
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