Percentages practice problems - page 30 of 99
Percentages are a way to express a number as a fraction of 100. They are often used to express a proportion or rate, such as a percentage of total sales or a percentage increase or decrease in a value. For example, if a product sells 25 out of 100 units, the percentage of units sold is 25%, which can also be written as 0.25 or 25/100.Percentage points, also known as percentage point change or "pp" for short, is the difference between two percentages. It is often used to express the change in a variable over time or between two groups. For example, if a company's profits increased from 10% to 20% over a year, the percentage point change would be 10 percentage points (20% - 10% = 10%).
Number of problems found: 1977
- Deposit
We deposited a total of $15,000 into simple interest accounts. The annual simple interest rate on one account at 6% the annual simple interest rate on the second account at 7%. How much should be invested in each account so that the total interest earned - Sharonsville fires
In the city of Sharonville, there were 678 structure fires in 1997. In 1999, the number of structure fires in Sharonville decreased by 26. By what percentage did structure fires decrease in Sharonville? - 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 nine 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 that was sold for 90.00 at a profit of 20 percent.
- 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 a random sample of 90 college students, 28 are found to have cars? Use a 0.05 level of significance. - The TV
The TV cost CZK 9,999. First, they reduced her price by 15%, and then they became more expensive by 15%. How much does television cost now? - Draw SSA triangle
Draw a triangle ABC if you know: alpha = 60° side b = 4 cm side a = 10 cm - Smartphones 49533
The factory produced 2,420 pieces of smartphones in February. How many smartphones did they make in weeks 1 and 2, when they increased production by 20% in weeks 3 and 4? - 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 unemployment rate: 0.5 1 1.5 2 2.5 3 in % (percent). Determine the two-sided confidence interval for the var
- The pool
There is 210 l of water in the pool. If you know that the pool is 30% full, calculate how many liters of water will fit into it. - 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% - Siblings 48821
Three siblings saved CZK 1,445. Adela saved 10% less than Martin and David 10% more than Adela. How many crowns did each of them save? - 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 shrunk by 10 percent. By how much percent has the area of land decreased? - 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.
- 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 to produce this roof if the seams and waste required an increa - Percentage 48523
Instead of 2000 pieces of yogurts, the dairy produced 2,800 pieces. By what percentage did it exceed the plan? - Students 48473
There are 30 students in the class. 70% of them have one sibling. How many students have one sibling? - Repair 48463
Car repair costs CZK 8,400. The owner paid 36% for the work and gave the rest for new parts. How much did he give for new parts? - Subsequently 48453
The book was increased by CZK 20% from CZK 350. The bookseller subsequently reduced it by 15% as it did not go on sale. What was its final price?
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