Percentages - 9th grade (14y) - math problems

Number of problems found: 545

  • Fixed expenses 2013
    Since 2013, the Slovak government plans to tax more small one person businesses. Instead of fixed expences 40% will be fixed expences 40% of gross income up to 420 Eur. Calculate what percentage of fixed expences will in 2013 pays from gross income 1569 E
  • Rectangle
    In a rectangle with sides, 8 and 9 mark the diagonal. What is the probability that a randomly selected point within the rectangle is closer to the diagonal than to any side of the rectangle?
  • Wire
    One pull of wire is reduced its diameter by 14%. What will be the diameter of wire with diameter 19 mm over 10 pulls?
  • Pipeline
    How much percent has changed (reduced) area of the pipe cross-section if circular shape changed to square with the same perimeter?
  • Money
    Everyone complains about the lack of money. In fact, there is no shortage of money, but the relative scarcity of goods and things that people buy for the money. Calculate what percentage of the price of all goods and services rose immediately, if everyone
  • Energy saving
    They were released three different, independent inventions saving 20%, 24% and 15% energy. Some considered that while the use of these inventions, the total savings will be 20% + 24% + 15% = 59%. Is this true? How much will percent of energy save all thre
  • Cone and cube
    About what percentage hase cone with base radius r larger volume than same high cube with square base with edge length r?
  • Shooter
    The probability that a good shooter hits the center of the target circle I is 0.1. The probability that the target hit the inner circle II is 0.58. What is the probability that it hits the target circle I or II?
  • Black building
    Keith built building with a rectangular shape 6.5 m × 3.9 m. Calculate how much percent exceeded the limit 25 m2 for small building. Building not built in accordance with the law is called "black building". Calculate the angle that the walls were clenchi
  • Event probability
    The probability of event P in 8 independent experiments is 0.33. What is the probability that the event P occurs in one experiment (chance is the same)?
  • Loans, loan ...
    In Slovakia, launched a short-term non-bank loans, of which few people have their "take" are considered unfavorable. Often, the borrower ends up in a spiral of debt, which takes more and more onerous loan used to repay earlier loans. Calculate how many 9-
  • Barrel of oil
    Barrel of oil weighs 283 kg. When it mold 26% oil, weighed 216 kg. What is the mass of the empty barrel?
  • Magnification of the square
    If we increase the square side, increase the content of the 70 %. About what percentage was increased his sides?
  • Glass mosaic
    How many dm2 glass is nessesary to produc 97 slides of a regular 6-gon, whose side has length 21 cm? Assume that cutting glass waste is 10%.
  • 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.
  • Sphere fall
    How many percent fall volume of a sphere if diameter decreases 3×?
  • 3y inflation
    Price of the roll rise in the first year by 9%, the second year fell by 5% and in the third year increased by 3%. Calculate the average annual increase in price of the roll.
  • Inflation
    Once upon a time, tsar owned a money printer and printed and printed. The result of printing money prices went up,in the first year 3.9 %, in the second 6%, in the third 4.7% and in the fourth 5.5%. Then tsar was failed in election. Calculate the average
  • Two doctors
    Doctor A will determine the correct diagnosis with a probability of 93% and doctor B with a probability of 79%. Calculate the probability of proper diagnosis if both doctors diagnose the patient.
  • Percentages and numbers
    How many percent is number 69 smaller than number 276?

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