Given price = 10 and tax_rate = 0.2, which code correctly outputs the total price including tax using interpolation?

hard📝 Application Q9 of 15

Ruby - Variables and Data Types

Given price = 10 and tax_rate = 0.2, which code correctly outputs the total price including tax using interpolation?

A"Total: #{price + price * tax_rate}"

B"Total: #{price + tax_rate}"

C"Total: price + price * tax_rate"

D"Total: #{price * tax_rate}"

Step-by-Step Solution

Solution:

Step 1: Calculate total price including tax
Total price = price + (price * tax_rate) = 10 + 2 = 12.
Step 2: Check interpolation expressions
"Total: #{price + price * tax_rate}" correctly calculates total inside #{ }. "Total: #{price + tax_rate}" adds price and tax_rate incorrectly. "Total: price + price * tax_rate" is a string literal. "Total: #{price * tax_rate}" shows only tax amount.
Final Answer:
"Total: #{price + price * tax_rate}" -> Option A
Quick Check:
Use expressions inside #{ } for calculations [OK]

Quick Trick: Put full calculation inside #{ } to show computed result [OK]

Common Mistakes:

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