What are the different types of rigorous courses, and what type of credit do they award

Sarah borrowed $16,500 on may 23 with interest due on september 3. if the interest rate is 9%, find the interest on the loan using exact interest and ordinary interest.

Luc do purchased stocks for $6,000. he paid $4,000 in cash and borrowed $2,000 from the brokerage firm. he bought 100 shares at $60.00 per share ($6,000 total). the loan has an annual interest rate of 8 percent. six months later, luc do sold the stock for $65 per share. he paid a commission of $120 and repaid the loan. his net profit was how much? pls

What resourse is both renewable and inexpensive? gold coal lumber mineral