How much money does Bala have in his kiddy bank after 4 days?
A) Rs. 6
B) Rs. 10
C) Rs. 18
D) Rs. 21
Correct Answer: B
Solution :
Amount Bala puts in his kiddy bank on the first day = Rs. 1 Amount he puts in the kiddy bank on 2nd, 3rd and 4th days = Rs. 2, Rs. 3 and Rs. 4 \[\therefore \] Total amount he has after four days = Rs. (1 + 2 + 3 + 4) = Rs. 10
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