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https://www.khanacademy.org/economics-finance-domain/core-finance/interest-tutorial/present-value/v/introduction-to-present-value?playlist=Finance
https://www.khanacademy.org/economics-finance-domain/core-finance/interest-tutorial/present-value/v/present-value-2?playlist=Finance
https://www.khanacademy.org/economics-finance-domain/core-finance/interest-tutorial/present-value/v/present-value-3?playlist=Finance
https://rasmussen.webex.com/rasmussen/ldr.php?RCID=1312af7c2107b9a6447fdaebb2428488