Total campaign revenue from prices and quantities

Question

Marketing sends you two parallel lists: the unit price of each item sold in a campaign and the quantity sold. You need one revenue number for the campaign report.

Write a function `total_revenue(prices, quantities)` that multiplies each price by the quantity at the same position, sums the results,

Accepted Answer

Step 1: `zip(prices, quantities)` walks both lists together and yields `(price, quantity)` pairs — no index bookkeeping needed. Step 2: The generator expression `p * q for p, q in zip(...)` produces one line-item revenue per pair, and `sum()` folds them into a single number. Step 3: `float(total)` guarantees a float even when every input is an integer (an empty campaign would otherwise return the integer `0`). Step 4: `round(..., 2)` matches the currency precision the finance team expects.

Total campaign revenue from prices and quantities

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