A merchant bought goods worth 8,000 riyals, paid half the price in cash, and agreed to pay the rest at the end of 6 months, and the seller deducted the bill once received and found that the trade discount is 1.08 of the correct discount. If you know that discount rate equals interest rate, Calculate the following: I) Interest rate. II) The basic value of the bill.

Salem purchased a shirt for US$20 from the Niagara outlet mall in Buffalo on his credit card. The actual transaction on the statement shows a value of C$22.45. It also includes 2.5% commission. Calculate the exchange rate used by the bank on the statement to two decimal places.

Mai borrowed $5000 from a bank for 5 years and was charged simple interest. The total interest that she paid on the loan was $1500. As a percentage, what was the annual interest rate of her loan? If necessary, refer to the list of financial formulas. []% ?