১৬১৮১
A certain principal amount, invested at simple interest, grows to Tk. 815 after 3 years and Tk. 854 after 4 years. What is the original principal amount?
উত্তর
Tk. 698
১৬১৮২
The ratio of the present ages of a mother and son is 7 : 2. After 7 years, the ratio of their ages becomes 8 : 3. What will be the ratio of their ages after 11 years?
উত্তর
12 : 5
১৬১৮৩
A sum of Tk. 30,000 yields a compound interest of Tk. 4347 when invested at 7% per annum. What is the investment period in years?
উত্তর
2 years
১৬১৮৪
What will be the total amount after 3 years if Tk. 1200 is invested at a simple interest rate of 5% annually?
উত্তর
Tk. 1380
১৬১৮৫
A bank offers 5% compound interest calculated half-yearly. A customer deposits Tk. 1600 on 1st January and another Tk. 1600 on 1st July of the same year. How much interest will he earn at the end of the year?
উত্তর
Tk. 121
১৬১৮৬
Two numbers are in the ratio 2 : 3. If 4 is subtracted from the first number, the ratio becomes 1 : 2. What are the numbers?
উত্তর
16, 24
১৬১৮৭
The simple interest on a certain sum at 6% p.a. is Tk. 360 in 1 year. What will be the additional interest earned in 1 year if the rate increases to 7% p.a. on the same sum?
উত্তর
Tk. 60
১৬১৮৮
What is the difference between simple and compound interest at 10% per annum on a sum of Tk. 5,000 at the end of 2 years?
উত্তর
Tk. 50
১৬১৮৯
A mixture contains copper, zinc, and tin in the ratio 2 : 3 : 5. If the total weight of the mixture is 50 grams, how many grams of tin are there in the mixture?
উত্তর
25 grams
১৬১৯০
The simple interest on a sum of money is Tk. 720 in 12 years. If the principal is doubled after 6 years, what will be the total interest at the end of 12 years?
উত্তর
Tk. 1080