Need help....please solve only problem no-1

Problem no -1

Find i (the rate per period) and n (the number of periods) for the following annuity. Semiannual deposits of $3,000 are made for 18 years into an annuity that pays 5.3% compounded semiannually. (Type an integer or a decimal.) n=3) Calculate the profit margin per unit of the Drinkworks machine, at a price of $199, $249, and $299. Show and explain your calculations. Keep in mind that Keurig is NOT a retailer, and thus you have to take retailer margins and wholesaler margins into consideration