Last year the prices of beef at damon’s butcher shop fluctuated. during the same 12 month period the amount of beef sold each quarter changed. in the first quarter, between january and march, damon’s shop sold 30,000 pounds of beef. the shop sold 60,000 pounds of beef between april and june, and then 50,000 pounds between july and september. between october and december the shop sold 20,000 pounds of beef. utilizing a demand schedule where all other factors are constant, when was the price of beef at its lowest? a. january - march c. july - september b. april - june d. october - december