A) Rs. 0
B) Rs. 2x
C) Rs. (x+y)
D) Rs. 2y
Correct Answer: A
Solution :
Cost of T-shirt\[={{x}^{2}}-xy-{{y}^{2}}\] Cost of sweater \[=2{{x}^{2}}+8xy-2{{y}^{2}}\] Cost of jeans\[={{x}^{2}}-3xy+4{{y}^{2}}\] Total Amount to be paid \[={{x}^{2}}-xy-{{y}^{2}}+2{{x}^{2}}+8xy-2{{y}^{2}}+{{x}^{2}}\] \[-3xy+4{{y}^{2}}\] \[=4{{x}^{2}}+4xy+{{y}^{2}}\] \[={{(2x+y)}^{2}}\] \[(\because {{(a+b)}^{2}}={{a}^{2}}+2b+{{b}^{2}})\] Amount Mohit paid to the cashier\[={{(2x+y)}^{2}}\] \[\therefore \]Amount Mohit receives \[={{(2x+y)}^{2}}-{{(2x+y)}^{2}}=0\]You need to login to perform this action.
You will be redirected in
3 sec