erie will invest $1.5mm in each tqm's channel support systems and unep green program initiatives. it is known that the investment ($3.0mm in total) will increase demand for erie products by about 3.5% this and in all future rounds. assume the next couple of years' sales and contribution margin will be similar to this year if no program is implemented. and assume future years' margins at the current year's level. what is the payback time in months for the proposed investment? payback time