Question
The average of four numbers is 58. When four more numbers
are included, the average increases by 4. Find the average of the numbers included.Solution
Sum of the 4 numbers = 58 × 4 = 232
New average = 58 + 4 = 62
Sum of 8 numbers = 62 × 8 = 496
Sum of new 4 numbers = 496 - 232 = 264
Required average = 264 ÷ 4 = 66
A person lent a sum at simple interest for 6 years. If the rate had been 5% more, he would have earned Rs. 750 extra. What was the principal?
Rs.7600 is divided into two parts such that if one part be invested at 4% and the other at 5%, the annual interest from both the investments is Rs. 336....
'Iqbal' deposited Rs. 11,200 in a SIP at simple interest of 13% p.a. If he earned Rs. 8,736 as interest, then find the duration (in years) for which the...
A sum when invested at simple interest of 10% p.a. becomes Rs. 1,680 in 4 years. If the same sum was invested at compound interest of 20% p.a. for 2 yea...
The interest earned when a sum is invested at simple interest of 12% p.a., for 3 years, is Rs. 4500. What will be the total amount received after 2 year...
Rs. 9500 is invested in scheme ‘A’ for a year at simple interest of 50% p.a. The interest received from scheme ‘A’ is reinvested for 2 years in ...
- An amount of Rs. 12,000 invested at simple interest for 4 years becomes Rs. 17,280. Calculate the annual rate of interest.
Rs. (n + 200) invested on simple interest amounts to Rs. 2,400 and Rs. 2,880 in 4 years and 6 years, respectively. Find the value of 'n'.
Rohan deposited Rs. 15,000 in scheme ‘A’ which offers simple interest of 12% p.a., for 4 years and Rs. 10,000 in scheme ‘B’ which offers simple ...
Simple interest and compound interest (compounded annually) earned on a sum at the end of 2 years at a certain rate of interest p.a. are Rs. 2700 and Rs...
Relevant for Exams:
