Question
Rina lent Rs. 18,000 to her brother at a compound
interest rate of 'y%' per annum, compounded annually. After one year, her brother paid her Rs. 19,440 to clear his debt. If Rina had lent the money at simple interest of (y + 4)% per annum instead, for the same period, how much interest would she have earned?Solution
ATQ, First, calculate the compound interest rate 'y': 
Now, compute the interest with simple interest formula at (y + 4)%: Hence, Required interest =Â Â 
 Rs.2160 She would have earned Rs. 2160 in interest.
2, 17, 147, 1167, 8157, 48957
4 , 3, 4 , ? , 32
3, 7, 16, 35, ?, 153
If  2,  7, 20,  x ,  110,  235,
Then,  7 x + 7√x = ?
64Â Â Â Â Â Â 66Â Â Â Â Â Â Â 76Â Â Â Â Â Â 126Â Â Â Â Â Â 376Â Â Â Â Â Â Â ?
...40, 20, 30, 75, ?, 1181.25
400Â Â Â Â Â Â Â Â Â 596Â Â Â Â Â Â Â Â Â 452Â Â Â Â Â Â Â Â Â 552Â Â Â Â Â Â Â Â Â 488Â Â Â Â Â Â Â Â Â 524
100         a     �...
51Â Â Â 86Â Â Â 121Â Â Â 156Â Â Â 191Â Â Â ?
If 5,  6,  4,  39,   x,  585,
then, find the value of ((x/2) + 1 + 2x)?
7 12 33 ? 635 3804
...
Relevant for Exams:
