Assume a company sells a single product. if q equals the level of output, p is the selling price per unit, v is the variable expense per unit, and f is the fixed expense, then the safety margin in dollars is: ans:

a. f/[q(p-v)].
b. q*p - f/[q(p-v)].
c. q*p - f/[(p-v)/p].
d. f/[(p-v)/p].