# Percentages practice problems - page 102 of 104

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: 2069

- Iron

Iron ore contains 54% iron. How much iron ore is needed to produce 23 tons of iron? - Descent of road

The road sign informs us the gradient is 10.9%. Calculate the angle at which the average decreases. - Isosceles right triangle

Calculate the area of an isosceles right triangle whose perimeter is 810 cm. - Barrel of oil

The barrel of oil weighs 283 kg. When it molded 26% oil, it weighed 216 kg. What is the mass of the empty barrel?

- Extreme temperatures

The USA hit an extreme heat wave. Calculate the percentage of the air temperature change from normal summer temperature $t2 °C to $t1 °C. - Bulbs

The probability that the bulb can operate 4000 hours is 0.3. What is the probability that exactly one of the eight bulbs can operate 4000 hours? - Magnification of the square

If we increase the square side, increase the area of the 57 %. About what percentage was increased on its side? - Promile

Calculate the 17.6 ‰ of 353. - Slovakia banks

It is an unwritten rule that the larger bank in Slovakia (number of clients, balance sheet) has the worst / more expensive services offered to clients. Perhaps customs and herd customers prefer only the trio SLSP, VUB, and Tatrabanka. Calculate how many t

- Tesco Clubcard

František got on quarterly billing vouchers for Tesco ClubCard taking goods worth 6.5 Eur. Calculate how much per month Tesco stores bought goods on average. Tesco ClubCard works for every Euro spent; you get one ClubCard point that Tesco will convert to - Trio

20 children lined up in groups of three. How many children did not create a trio? - Human buying irrationality

I longer watch processors for Socket A on the secondhand market, Athlon XP 1.86GHz with a PR rating of 2500+ costs $7, and Athlon XP 2.16Ghz with a PR rating of 3000+ currently costs $16. Calculate: About what percentage of the Athlon XP 2.16Ghz is more p - Glass mosaic

How many dm² glasses are necessary to produce 97 slides of a regular 6-gon, whose side has a length 21 cm? Assume that cutting glass waste is 10%. - Barrel with liquid

Barrel with grain weight 297 kg. When it sheds 48% of grain, ha weight 174 kg, what is the weight of an empty barrel?

- Window

Peter demolish a box hole in the wall for the window frame 147×51 cm. When they come, they will find a master-fitted frame and window that glass is 13.3 cm from the hole in each direction. Calculate how much percent less light enters the window than - VAT

VAT is a tax on which the state artificially betrays goods and services for final consumption. VAT in Slovakia is 20%. Calculate how much percent pay fewer tax residents of Japonska, when VAT is only 5%. - Discounts on rail (ZSSK)

The railway company ZSSK offers a discount of 15% (REGIONAL) for 5 Eur/year. Calculate the real discount rate as a percentage, where passengers will travel 19 Eur per week. - Solidarity

Imagine a word solidarity means that salt donation to the needy, who have neither the salt. If we take the word solidarity has a word base on salt + gift (only in the Slovakian language). Calculate how many kilos of salt a sympathetic citizen "gives" gove - Sphere fall

How much percent fall volume of a sphere if diameter decreases 3×?

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