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1- A company took a loan of 20 million Saudi riyals for a period of one year with a nominal interest of 10%. calculate the cost of interest? Calculate the effective interest rate? 2 - Assuming that the company took the loan for only three months, it said 90 days. calculate the interest cost that must be paid by the company? 3- If the bank has deducted interest in advance. calculate the effective interest rate? 4- if the loan is an installment loan. calculate the simple effective interest rate? Calculate the discounted effective interest rate