Question

Kiersten runs a website that helps people learn programming. Every month, Kiersten receives a subscription fee of $10 from each of the subscribers to her website. Last month, the website had 100 subscribers. This month, 30 new members joined the website, and 10 members cancelled their subscription

Answer 1

Last month, Kiersten earned $1000 (wow that's a lot of money :3) and this month, she earned $1200.

Answer 2

Last month's income: $1000

This month's income = $1200

Explanation:

Number of subscribers for last month = 100

Fee per subscriber = $10

Sol, last month's income = 100(10) = 1000

This month, 30 new members joined and 10 of the existing members cancelled their subscription.

So, number of subscribers this month = 100 + 30 - 10 = 120

This month's income = 120(10) = 1200