A) \[Rs.\,(21x+3y)\]
B) \[Rs.\,(3x+9y)\]
C) \[Rs.\,(21x+9y)\]
D) \[Rs.\,(7x+3y)\]
Correct Answer: A
Solution :
Amount of money spend in 1 day = Rs. x So, amount of money spend in 7 days \[=Rs.(7x)\] \[\Rightarrow \] Amount of money spend in 1 week = \[Rs.(7x)\] Amount of money saved in 1week = Rs.y \[\therefore \] Income in 1 week \[Rs.\,(7x+y)\] So, income in 3 weeks \[=Rs.[3\times (7x+y)]\] \[=Rs.\,(21x+3y)\]
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