If I purchase a pair of shoes for $39.99 and the shoes were originally priced at $49.99, what sales discount did I receive? O a. 20% O b. $10.00 O c. 25% O d. both (a) and (b) O e. both (b) and (c) O f. Not enough information is provided to answer the question. After we have sold our breakeven number of units, 100% of the unit contribution for each subsequent unit sold represents profit. O True O False