Logarithm + percentages - practice problems
Number of problems found: 22
- Compound interest
Joel borrowed $3208.5 on November 2, 2021, at 3.6% p.a. How many days would it take for him to repay the loan if he made a payment of $ 3,720.34? Round up to the nearest day. - Years 3
How long will it take for a given sum of money to triple itself at 20% annual compound interest? - Deposited 83235
A student deposited €500 in a savings bank at 2.5% interest. In what time (in years) will he earn as much interest as he invested? - Millimeters 82983
Determine what thickness of the shielding material will be required if we reduce the radiation to 3% of the original value if we know that a thickness of 6 mm will reduce the level of the same radiation by 9%. Round up to the whole value in millimeters (t
- Written 81992
8% of the price of the machine is written off every year. In how many years will the price drop from 250,000 to 150,000? - Interest 81982
The bank offers interest on the deposit of 4 percent per annum. In how many years will the deposit double? - Interest 37571
We will deposit € 10,500 at the bank at 1.1% interest, and we want to withdraw € 11,000. How many years do we have to wait? Round to 2 decimal places. - Withdraw 37161
We will put € 8,500 into the bank at 1.3% interest, and we want to withdraw € 8,700. How many years do we have to wait? Round to 2 decimal places. - Diameter 36363
With a single pull, the wire diameter is reduced by 10%. How many draws are required to minimize the wire diameter from 5 mm to less than half?
- Decibel
What percentage of sound intensity increases if the sound intensity level increases by 1 dB? - Percentage increase
What is the annual percentage increase in the city when the population has tripled in 20 years? - Growth of wood
The annual growth of wood in the forest is estimated at 2%. In how many years will make the forest volume double? - An investment
How long will it take for an investment to double at a simple interest rate of 5.10% per annum? Express the answer in years and months, rounded up to the next month. - Interest 6047
Mr. Demikát took out a loan worth 5,000 euros from the bank with an interest rate of 12 percent. How many months will it repay if the monthly payment is 80 euros?
- Car value
The car loses value by 15% every year. Determine a time (in years) when its price will halve. - Population
The town has 159,000 inhabitants. 25 years ago, there were 158,000. How many people will live in a city in 10 years if the population's average rate is as in previous years? - Future of libraries
You know that thanks to the Internet, electronic communications and the development of online resources on the Internet annually decline, the number of traditional readership by 17%. This deal is the irreversible evolutionary shift from old books from lib - Crystal
The crystal grows every month 1.2 permille of its mass. How many months to develop a crystal from weight 177 g to 384 g? - Demographics
The population grew in the city in 10 years from 30000 to 34000. What is the average annual percentage increase in population?
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