Which of the following statements about mark-up pricing is true?

a) When a mark-up approach is used, the resulting price should be based solely on the computed amount.

b) Everything else being the same, the multiple for the ingredient mark-up approach to pricing will be positively related to the selling price.

c) In the ingredient mark-up approach to pricing, the multiple is determined by dividing 1 by the difference of 1 and the desired ingredient cost percentage.

d) With mark-up approaches to pricing, historical pricing strategies should be ignored.