for ques no. 18 try to construct the demand curve on X Y plane
the vertical intercept will be at p=20 and horizontal intercept will be at q=10 with a kink at p=q=10
total cost will remain fixed=50
now consider option A..TR=15*5=75
if we decrease price by 1 unit and thus increase quantity by 1 unit we will get larger profit
at p=14 TR=14*6= 84 and so on
finally we will reach at p=q=10 with TR=100
at a price less then 10 q will remain constant at any price so TR will decrese
so ans is P=10 which max profit
Akshay Jain
Masters in Economics
Delhi School of Economics
2013-15