# Compound Interest

1.   $\rhd$ The constant $e$ and compound interest (11:38)
Sal discusses borrowing a dollar for a year at $100\%$ interest compounded once, twice, monthly, daily, and continuously (approximately).
2.   $\rhd$ The constant $e$ as a limit. (5:39)
3.   $\rhd$ Evaluating the natural logarithm with a calculator.(3:37)
Sal evaluates $\log_3 67$ $\ln 67$ with a TI graphing calculator.