Question

joaquin invirtio su dinero a 12% y a 15% obteniendo unos intereses de $3000. si las cantidades que invirtio hubieran sido intercambiadas, habria tenido un retorno de $2940 .cuanto dinero invirtio a 15%?​

Answer 1

$12,000

Step-by-step explanation:

We know that:

0.12A + 0.15B = $3000

If the amounts were inverted:

0.12B + 0.15A = $2940

Solving the system of equations:

0.12A + 0.15B = $3000

0.12B + 0.15A = $2940

The solutions are:

A = 10,000

B = 12,000

So Joaquin invested 12,000 at 15%.