1.If the simple interest on a certain principal at 4% per annum for 2 years is Rs. 80, what will be the compound interest on the same principal amount for the same duration?
2.Calculate the compound interest on Rs.1600 for a period of 9 months at an annual interest rate of 20%, compounded quarterly.
3.What is the compound interest earned on Rs. 20,000 after 3 years at an annual interest rate of 10%?
4.An amount of Rs. 8000 grows to Rs. 9261 at a compound interest rate of 5% per annum. How many years does it take for this growth?
5.Calculate the compound interest earned on a principal of Rs. 5000 at an annual interest rate of 4%, compounded half-yearly, over a period of 1.5 years.
6.If Rs. 7,500 is borrowed at a compound interest rate of 4% per annum, what will be the total amount payable after 2 years?
7.Calculate the compound interest and the total amount on Rs. 8000 invested at an annual interest rate of 5% for 3 years, with interest compounded yearly.
8.A steamboat travels downstream from one harbor to another in 4 hours and returns upstream over the same distance in 5 hours. If the current's speed is 2 km/h, what is the distance between the two harbors?
9.A motorboat's speed is in the ratio 36:5 compared to the speed of the water current. If the boat takes 5 hours and 10 minutes to travel downstream, how long will it take to return upstream?
10.A boat travels at a speed of 5 km/h in still water. It covers 30 km upstream and then returns downstream to the starting point in a total of 4 hours and 30 minutes. What is the speed of the current?
11.A boat travels 30 km downstream in 2.5 hours and returns the same distance upstream in 3.75 hours. What is the boat's speed in still water?
12.A boat travels 24 km downstream in 10 hours, but takes 2 hours longer to cover the same distance upstream. What is the boat's speed in still water?
13.A boat travels 24 kilometers downstream in 4 hours, while it takes 6 hours to cover the same distance upstream. What is the speed of the boat in still water?
14.A person rows at a speed of 9 km/h in still water. He takes 4.5 hours to travel from point A to point B and back again. If the current flows at 1 km/h, what is the distance between points A and B?
15.A man rows a boat at 15 km/h in still water. If the river current flows at 3 km/h, how long will it take him to travel 60 meters downstream?
16.A boat travels downstream at 15.5 km/h and upstream at 8.5 km/h. What is the velocity of the current?
17.A person rows a boat at 18 km/h downstream and 10 km/h upstream. What are the speeds of the person in still water and the current, respectively?
18.A man rows 30 km downstream and 20 km upstream in a total of 4 hours. He also rows 45 km downstream and 40 km upstream in 7 hours. What is his speed in still water?
19.A man rows a boat such that the time taken to travel a certain distance upstream is double the time taken to cover the same distance downstream. If the boat's speed in still water is 42 km/h, what is the velocity of the current?
20.A man rows a boat at a speed of 20 km/h in still water. If the current flows at 6 km/h, how long will it take him to travel 60 km downstream?