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ser zółty
12 zł ----- 100%
x ----- 105%
100x = 12*105
100x = 1260 / : 100
x = 12,60 zł
chleb
3,4zł ----- 100%
x ----- 120%
100 x = 3,4 * 120
100x = 408 / :100
x = 4,08zł
jogurt
1,2 ---- 100%
x ---- 110%
100 x = 1,2 * 110
100 x = 132 /: 100
x = 1,32zł
3.40 x 20% = 3.40 x 20:100 =68:100 = 0.68zł 3.40 + 0.68 = 4.08 chleb po podwyzce
1.20 x 10% = 1.2 x 10:100= 12:100= 0.12zł 1.20 + 0.12 = 1.32 jogurt po podwyzce