1003055401
Level:
A
The number \( x\) is by \( 10\% \) bigger than the number \( y \). It means that:
\( x-y=0.1y \)
\( x = y +10\% \)
\( y=\frac9{10}x \)
\( x - 0.1x = y \)
Percent problems and financial mathematics
1003055402
Level:
A
Mr. Nowak obtained the income of \( 20200 \) zlotys from his business activity in \( 2011 \). He settled with the tax office, paying a tax in the amount of \( 19\% \) of his income. In \( 2011 \), Mr. Nowak's income tax amounted to:
\( 3838\,\mathrm{zł} \)
\( 16362\,\mathrm{zł} \)
\( 1063.16\,\mathrm{zł} \)
\( 383.80\,\mathrm{zł} \)
1003055403
Level:
A
The price of one share of a certain firm decreased by \( 10\% \) from the initial price of \( 180 \) zlotys in one day, and the next day it increased by \( 10\% \). After these changes, the price of one share amounted to:
\( 178.20\,\mathrm{zł} \)
\( 145.80\,\mathrm{zł} \)
\( 217.80\,\mathrm{zł} \)
\( 180\,\mathrm{zł} \)
1003055404
Level:
A
\( 1100 \) people were asked to say which of the following activities (cooking, ironing, playing a musical instrument) they are bad at. \( 42\% \) of them are bad at cooking, \( 67\% \) of them are bad at ironing, \( 85\% \) of them are bad at playing a musical instrument. How many people who can cook can we expect in the group of \( 1200 \) people?
\( 696 \)
\( 969 \)
\( 504 \)
\( 638 \)
1003055405
Level:
A
The statistical office reported that inflation amounted to \( 4.5\% \) in October and \( 4.3\% \) in September. It means that from September to October inflation has increased by:
\( 0.2 \) percentage points
\( 2 \) percentage points
\( 2\% \)
\( 0.2\% \)
1003055406
Level:
A
A phone subscription in Telekomunikacja Polska is \( 35 \) zlotys. How much is the subscription fee if you add up a \( 7\% \) tax to it?
\( 37.45\,\mathrm{zł} \)
about \( 38\,\mathrm{zł} \)
\( 37\,\mathrm{zł} \)
\( 37.50\,\mathrm{zł} \)
1003055407
Level:
A
A \( 4\,\mathrm{kg} \) salt solution was prepared in the chemistry lab. The solution contains \( 250 \) g of salt. Calculate the percentage concentration of the solution.
\( 6.25\% \)
\( 6\% \)
\( 10\% \)
\( 25\% \)
1003055408
Level:
A
How much pure gold contains a ring weighing \( 7 \) grams if the gold fineness is \( 750 \)? (That means, the gold content is \( 75 \) percent.)
\( 5.25\,\mathrm{g} \)
\( 5\,\mathrm{g} \)
\( 6\,\mathrm{g} \)
\( 5.5\,\mathrm{g} \)
1003055409
Level:
A
In Gdańsk, a kilogram of strawberries costs \( 4 \) zlotys and in Płock it costs \( 2.50 \) zlotys. The price of strawberries in Gdansk is higher than the price of strawberries in Płock by:
\( 60\% \)
\( 62.5\% \)
\( 37.5\% \)
\( 40\% \)
1003055410
Level:
A
Support for a political party X in March \( 2017 \) was \( 24\% \), and in September \( 2017 \) it was \( 30\% \). Party X noted an increase in support by:
\( 6 \) percentage points
\( 20 \) percentage points
\( 6\% \)
\( 20\% \)