Natal Technologies is developing a superior ultrasound machine for which it is required to invest $800,000. Based on the company's analysis, the product will generate $200,000 from the first year till perpetuity. According to this, the payback period is . a. 10 years.
b. 6 years.
c. 3 months.
d. 4 years.

Within the relevant range, if there is a change in the level of the cost driver, then a. total fixed costs will remain the same and total variable costs will change b. total fixed costs will change and total variable costs will remain the same c. total fixed costs and total variable costs will change d. total fixed costs and total variable costs will remain the same