| Me deben el $15\,\%$ de $S/.\,540$ y me pagan el $20\,\%$ de $S/.\,300$, Entonces, me debe aún: | |
| $A)$ | $25\,\%\,de\,S/.\,72$ |
| $B)$ | $20\,\%\,de\,S/.\,75$ |
| $C)$ | $60\,\%\,de\,S/.\,36$ |
| $D)$ | $50\,\%\,de\,S/.\,42$ |
| $E)$ | $75\,\%\,de\,S/.\,60$ |
Solución
| Realizando el análisis: | ||
| Me deben: | ||
| $15\,\%\, de\, S/.\,540$ | ||
| $\dfrac{15}{100} \times 540$ | ||
| $\dfrac{15}{10} \times 54$ | ||
| $\dfrac{15\times 54}{10}$ | ||
| $\dfrac{810}{10}$ | ||
| $Me\,deben=S/.\,81$ | ||
| Me Pagan: | ||
| $20\,\%\, de\, S/.\,300$ | ||
| $\dfrac{20}{100} \times 300$ | ||
| $\dfrac{1}{5} \times 300$ | ||
| $S/.\,60$ | ||
| Me deben aún: | ||
| $81-60$ | ||
| $S/.\,21$ | ||
| Por deducción, en las respuestas: el $50\,\%$ es la mitad | ||
| $50\,\%\,de\,S/.\,42$ | ||
| $S/.\,21$ | ||
| La solución es la Alternativa D | ||