Ritchie manufacturing company makes a product that it sells for $160 per unit. the company incurs variable manufacturing costs of $84 per unit. variable selling expenses are $12 per unit, annual fixed manufacturing costs are $470,000, and fixed selling and administrative costs are $208,400 per year. required determine the break-even point in units and dollars using each of the following approaches: use the equation method. use the contribution margin per unit approach. use the contribution margin ratio approach. prepare a contribution margin income statement for the break-even sales volume.

Rate of return, standard deviation, coefficient of variation personal finance problem mike is searching for a stock to include in his current stock portfolio. he is interested in hi-tech inc.; he has been impressed with the company's computer products and believes hi-tech is an innovative market player. however, mike realizes that any time you consider a technology stock, risk is a major concern. the rule he follows is to include only securities with a coefficient of variation of returns below 1.07. mike has obtained the following price information for the period 2015 through 2018:hi-tech stock, being growth-oriented, did not pay any dividends during these 4 years. a. calculate the rate of return for each year, 2015 through 2018, for hi-tech stock. b. assume that each year's return is equally probable and calculate the average return over this time period. c. calculate the standard deviation of returns over the past 4 years. (hint: treat this data as a sample.) d. based on b and c determine the coefficient of variation of returns for the security. e. given the calculation in d what should be mike's decision regarding the inclusion of hi-tech stock in his portfolio?