[tex] \blue{a)100 \times \frac{10}{100} = \frac{1000}{100} = 10 \: lei} \\ \blue{100 + 10 = 110( \: lei \: dupa \: cresterea \: pretului)} [/tex]
[tex] \pink{b)110 \times \frac{10}{100} = \frac{1100}{100} = 11} \\ \pink{110 - 11 = 99(lei \: dupa \: scaderea \: pretului)} [/tex]