Question

Daca o minge costa 45 lei si s a scumpit cu 20 la suta. Care este noul preț al mingii?

Answer 1

45+20%*45=45+20/100*45=45+1/5*45=45+9=54 lei

Answer 2

Deci stim ca in prezent coasta 45 de lei si ea se scumpeste cu 20% adica 20/100.
Calculam astfel:
[tex]45lei+ \frac{20}{100} scumpirea\\\\ 45= \frac{45}{1} \\\\ \frac{45}{1} (amplificam~cu~100/aducem~la~acelasi~numitor)+ \frac{40}{100} \\\\ \frac{4.500}{100} + \frac{40}{100} =\\\\ \frac{4.540}{100} =45,4lei [/tex]