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6. Ján zarobil na brigáde 360€. Z toho má zaplatiť daň vo výške 19%. Koľko eur má zaplatiť?
Spolu..................360 €
Daň......................19 %
? € má zaplatiť?
100 %...............360 €
19 %.....................x €
19:100 = x:360
6840 = 100x / :100
68,40 = x
Ján má zaplatiť daň vo výške 68,40 €.
7. V obchode majú 60 vodovodných batérií. Tri pätiny z nich sú vaňové, ostatné sú umývadlové. Koľko je vaňových batérií ?
Spolu..................60 batérií
Vaňové...............3/5 x............(3/5)*(75/2) = 45/2 = 22 (1/2)
Umývadlové.........x..........................................37 (1/2)
(3/5)x+x = 60
(8/5)x = 60 /:(8/5)
x = 75/2 = 37 (1/2)
Vaňových batérií je 22.
8. Vypočítajte koľko je:
1 % z 300 = (1/100) * 300 = 3/1 = 3
20 % z 80 = (20/100) * 80 = 16/1 = 16
9. Vypočítajte, koľko percent je:
18 bodov z 20 bodov
a = 100 * (18/20)
a = 1800/20
a = 90 %
5 žiakov zo 120 žiakov
a = 100 * (5/120)
a = 500/120 = 25/6
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