A scooter was bought at ₹ 42,000.Its value depreciated at the rate of 8% per annum.Find its value after one year.

In a laboratory,the count of bacteria in a certain experiment was increasing at the rate of 2.5% per hour.Find the bacteria at the end of 2 hours if the count was initially 5,06,000.

A machine costs 5,00,000. If its value depreciates 15% in the first year, 13 (1/2) % in the second year, 12% in the third year and so on. What will be its value at the end of 10 years, when all the percentages will be applied to the original cost? [Total depression =15 + 13(1/2) + 12+ ......10 terms S_(n) = 10/2[30-13.5] = 82.5% therefore after 10 years original cost = 100 - 82.5 = 17.5, i.e. 17.5% of 5,00,000.

In a bank, principle p increases continuously at the rate of 5% per year. Find the principal in terms of time t.

A man deposited Rs 10000 in a bank at the rate of 5% simple interest annually. Find the amount in 15^(th) year since he deposited the amount and also calculate the total amount after 20 years.

A man deposited Rs 10000 in a bank at the rate of 5% simple interest annually. Find the amount in 15^(th) year since he deposited the amount and also calculate the total amount after 20 years.

Arif took a loan of ₹80,000 from a bank.If the rate of interest is 10% per annum,find the difference in amounts he would be paying after 1 1/2 years if the interest is: (i) compounded annually.(ii)Compounded half yearly.

Susan invested certain amount of money in two schemes A and B which offer interest at the rate of 8% per annum and 9% per annum, respectively. She received Rs. 1860 as annual interest. However had she interchanged the amount of investments in the two schemes, she would have received Rs. 20 more as annual interest. How much money did she invest in each scheme?

Derive ionic product of water. Also find its value at 25^(@)C .

The population of a place increased to 54,000 in 2003 at a rate of 5% per annum.(i)Find the population in 2001. (ii)What would be its population in 2005?