David and his wife each receives an 8 percent annual rise. If David receives a raise Rs. 800 and his wife receives a raise of Rs. 840, what is the difference between their annual incomes after their raises? 


(a) 
Rs. 40 
(b) 
Rs. 460 
(c) 
Rs. 500 
(d) 
Rs. 540 
David and his wife each receives an 8 percent annual rise. If David receives a raise Rs. 800 and his wife receives a raise of Rs. 840, what is the difference between their annual incomes after their raises? 


(a) 
Rs. 40 
(b) 
Rs. 460 
(c) 
Rs. 500 
(d) 
Rs. 540 
Let David’s annual income be Rs. and his wife’s income be Rs.
Then, 8% of
And, of
Required difference = Rs. [(10500+840)(10000+800)]=Rs. 540.