Question
If a sum when placed at compound interest grows to
Rs.6,400 in 2 yrs and to Rs. 8,000 in 3 yrs, find the rate percent p.a.Solution
Let the principal be P. ∴ P + CI for 3 yrs = Rs. 8,000----- (i) And P + CI for 2 yrs = Rs. 6,400----- (ii) Subtracting (ii) from (i), we get CI for the 3rd yr = 8,000 – 6,400 = Rs. 1600 Thus, CI calculated in the 3rd yr is basically the interest on the amount generated after 2 yrs which is Rs. 6,400. R = (SI × 100)/(P × T) = (1600 × 100)/(6400 × 1) = 25 % p.a.
A sum of money is divided among P, Q, R and S in the ratio of 1:2:5:6 respectively. If the share of R's is Rs. 2850 more than the share of Q, then what ...
If the third proportion of 14 and 28 is “0.5k”, then find the value of (k − 10) : (k + 8).
The ratio of zinc and copper in a brass pieces is 2:7. How much zinc will be there in 180 kg of such a piece?
Two numbers are respectively 40% and 70% more than a third number. Find the ratio of two numbers.
If 50% of a certain number is equal to 3/5th of another number, what is the ratio between the numbers?
Rs.14000 was divided among A, B and C in the ratio 2:2:3. B kept Rs.1200 for himself, gave Rs.600 to his mother and divided the remaining money among hi...
If A: B = 4: 5 and B: C = 3: 7, then what is the value of (3A + 8C)/(6B - 2C)?
A boy is supposed to distribute Rs.2400 among his three friends P, Q and R in the ratio of 4:3:5 respectively, but mistakenly he distributed in the rati...
If the income of a family decrease by 6% and expenditure decrease by 8%, and its saving increases by 4%. Find the ratio of income and expenditure of th...
The total number of students in a school is 18644. If the ratio of boys to the girls in the school is 73:85 respectively, then find the total number of ...
Relevant for Exams:
