Challenge 3: String Templates — Solution

fun main() {
    val productName = "Wireless Mouse"
    var price = 24.99

    println("The $productName costs \$${price * 1.10} with tax included.")
}

/*
Output:
The Wireless Mouse costs $27.489 with tax included.

Notes:
- $productName is simple interpolation — just the variable name after $.
- \$ escapes the literal dollar sign so it isn't read as the start of a
  template expression.
- ${price * 1.10} is expression interpolation — anything beyond a bare
  variable name needs the ${ } braces, including arithmetic.
- (Rounding the displayed price to 2 decimal places would need
  String.format or "%.2f".format(price * 1.10) — a good preview of
  formatting, covered properly in a later chapter.)
*/