22. Find the Contribution margin ratio if the selling price per unit is $200, Fixed costs are $765500 and the variable cost per unit is $75.

34. In how many years will $1000 become $1300 at a rate of 5%?

49. If you deposited $40,000 in a bank and earned simple interest at 7 % per annum for two years. Calculate the interest earned at the end of the period.

51. A six-month term deposit at a bank offers a simple interest rate of 3.6% p.a. If a customer earned an interest amount of $75 over a 6 month period, how much did he deposit in the term deposit?