Exercise

Revenue per customer

You've been hired at Delivr as a data analyst! A customer just called Delivr's Customer Support team; she wants to double-check whether her receipts add up. Going by her receipts, she calculated that her total bill on Delivr is $271, and she wants to make sure of that. Her user ID is 15.

Help the Customer Support team by calculating her total bill! Sum up everything she's spent on Delivr orders; in other words, calculate the total revenue that Delivr has generated from her.

Instructions

100 XP

Write the expression for revenue.
Keep only the records of user ID 15.