# Percentages Problems

#### Number of problems found: 747

• The roof
The roof of the tower has the shape of a regular quadrangular pyramid, the base edge of which is 11 m long and the side wall of the animal with the base an angle of 57°. Calculate how much roofing we need to cover the entire roof, if we count on 15% waste
• Fertilizer
I have 4 liters of 10% fertilizer. How much water do I need to add to have a 2% solution?
• Ramon
Ramon earn's 1,810 each month and pays 53.20 bill on electricity. To the nearest tenth of a percent, what percent of Ramon's earnings are spent on electricity each month?
• Five years
Nakato Nobuki, a Japanese artist, wants to have \$24,000.00 in his savings account at the end of five years. Mr. Nobuki deposits \$1,500.00 annually into savings and has a balance of \$8,000.00 today. What must the interest rate on the savings account be for
• Edmond
Edmond Santos borrowed USD 20,000 for 18 months at 6 1/2 % per year. Find the APR (Annual Percentage Rate) if the loan was repaid monthly. The answer is: Note: APR is expressed as a percentage that represents the actual yearly cost of funds over the term
• Gym center
80% of all visitors to the gym center enjoy a discount. 3/4 of all visitors go to practice regularly. All visitors who go to the gym regularly benefit from a discount. What percentage of all visitors do not go to the gym regularly but still use the discou
• 25 pupils
25 pupils attend the school dance group, which is 5 percent of all pupils in the school. The judo class is attended by 20 pupils of the school, a quarter of whom also go to a dance group. How many schoolchildren do not go to a dance or judo group?
• Arrange
Arrange the following in descending order: 0.32, 2on5, 27%, 1 on 3
• Washing machine
The washing machine cost € 325. In sale-off, they became cheaper by 10%, later by another 10%. Find the last price of the washing machine.
• Forest land
The land area of 320 ha has 30% of the wood. How many hectares of land are not afforested?
• Rectangular land
Due to the new road, the longer dimension of the rectangular plot had to be shortened by 4 percent and the shorter dimension shortened by 10 percent. By how many percent has the area of land decreased?
• The conical roof
The conical roof above the warehouse has a diameter of the lower part (base) d = 11.2 m and a height v = 3.3 m. How many rectangular steel plates with dimensions of 1.4 m and 0.9 m were needed for the production of this roof, if the seams and waste requir
• Feed to hay
How many tons of water do we have to dehydrate from 8 tons of feed, if the original moisture is 54 percent, to get hay with a moisture content of 15 percent? Round to two decimal places.
• Three sigma rule
The height of trees in a given stand is known to be a quantity with a normal probability distribution with a mean value of 15 m and a variance of 5 m2. Determine the interval in which there will be tree heights in such a stand with a probability of 90%
• Unemployment rate
Over the last 16 years, the country's unemployment rate has changed according to the following frequency table: years of unemployment: 2 5 2 3 3 1 unemploymen rate: 0.5 1 1.5 2 2.5 3 in % (percent). Determine the two-sided confidence interval for the vari
• The TV
The TV costs CZK 9,999. First, they reduced her price by 15%, then they became more expensive by 15%. How much does television cost now?
• Level of significance
At a certain college it is estimated that 25% of the students have cars on campus. Does this seem to be a valid estimate if in random sample of 90 college students, 28 are found to have cars? Use a 0.05 level of significance.
• Duval
Duval went to bat 80 times during a baseball season. In the first half of the season he had 15 hits. In the second half of the season he had 9 hits. Which percent of the time did Duval get a hit during the entire season?
• Cost and profit
Find the cost price of an article which was sold for 90.00 at a profit of 20 percent.
• The Norris
The Norris family goes out for lunch, and the price of the meal is 52. The sales tax on the meal is 6% and the family also leaves a 20% tip on the pre-tax amount. What is the total cost of the meal?

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