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Jojo runs a website. Each month, she 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. How much money did she earn this month?

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Interesting fact:

Leonardo Da Vinci was raised in rural Tuscany, where he was home-schooled, and then sent to Florence in his teens to become an apprentice. He was trained as a lyre player and then later trained under the painter Andrea del Verrocchio, spending days simply observing the nature around him.