Saved Bookmarks
| 1. |
the compound interest calculated yearly on a certain sum of money for the second year is rs 1650 and for the third year is rs 1815 . Calculate the rate of interest and the sum of money |
|
Answer» Answer: Answer Correct option is A 12000 C.I. for the third year = Rs. 1,452. C.I. for the SECOND year = Rs. 1,320 ∴ S.I on Rs. 1,320 for ONE year = Rs. 1,452− Rs. 1,320= Rs. 132. RATE of interest = 1,320 132×100 =10%. Let the ORIGINAL MONEY be Rs. P. Amount after 2 year − amount after one year =C.I. for second year. P(1+ 100 10 ) 2 −P(1+ 100 10 )=1,320 P[( 100 110 ) 2 − 100 110 ]=1,320 ⇒P[( 10 11 ) 2 − 10 11 ]=1,320⇒P( 100 121 − 10 11 )= Rs. 1,320 ⇒P× 100 11 =Rs.1,320⇒P= 11 1,320×100 = Rs. 12,000 ∴ Rate of interest =10% and Original sum of money = Rs. 12,000 |
|