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The cost price of speaker S = Rs.800
The cost price of speaker Q = 800 + 100 = Rs.900
The cost price of speaker P = 900 * (5/3) = Rs.1500
The cost price of speaker R = 1500 * (100/75) = Rs.2000
The marked price of speaker P = 1500 * (140/100) = Rs.2100
The selling price of speaker P = 2100 * (80/100) = Rs.1680
The marked price of speaker S = 800 * (160/100) = Rs.1280
The selling price of speaker S = 800 * (120/100) = Rs.960
The discount percentage of speaker S = {(1280 – 960)/1280} * 100 = (320/1280) * 100 = 25%
The markup percentage of speaker Q = 25 * 2 = 50%
The marked price of speaker Q = 900 * (150/100) = Rs.1350
The selling price of speaker Q = 1350 * (100 – 28)/100 = 1350 * (72/100) = Rs.972

Answer: C
The profit percentage of speaker P = Y% = {(1680 – 1500)/1500} * 100 = (180/1500) * 100 = 12%
The profit percentage of speaker R = Y + 0.5 = 12 + 0.5 = 12.5%
The profit amount earned on speaker R = 2000 * (12.5/100) = Rs.250