<Unable to multiply due compile error in kotlin> B...

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Unable to multiply due compile error in kotlin
Beginner question - Any idea why my code won't compile? I based it on a code given in this codelab and the given code compiles just fine. Any help is greatly appreciated :)
<a href="https://developer.android.com/codelabs/basic-android-kotlin-training-tip-calculator?continue=https%3A%2F%2Fdeveloper.android.com%2Fcourses%2Fpathways%2Fandroid-basics-kotlin-unit-2-pathway-1%23codelab-https%3A%2F%2Fdeveloper.android.com%2Fcodelabs%2Fbasic-android-kotlin-training-tip-calculator#3" rel="nofollow...