Correct option is A
Cost price of A = 50P
Marked price of A = 120/100×50P = 60P
Selling price of A = 110/100×50P = 55P
Cost price of B = 15P
Marked price of A = 160/100×15P = 24P
Selling price of A = 120/100×15P = 18P
Total discount = (60P-55P)+(24P-18P)= 11P
Required percentage = 11P/(60P+24P)×100=13.09%= 13%(approx.)