Answer:
24
Step-by-step explanation:
Answer: 3/K
Step-by-step explanation:
From the question, we are informed that Mary bought K stamps for 3 dollars and we are told to find the cost of one stamp.
Number of stamps bought = K
Cost of K stamps bought = 3 dollars
Cost of ones stamp = Cost of stamps bought ÷ Number of stamps bought
= 3/K
Therefore, the cost of one stamp is 3/K
156 because 12 times 13 is 156
The selling price is 2.5 times the cost. If the cost goes up by 0.25, the selling price needs to go up by 2.5*0.25 = 0.63 in order to maintain the gross margin.
