3.- Now we change in the expression of the interest rate. Here it is not expressed on an annual basis, but for a specific period of time. Calculate the simple commercial interest of: (a) $45,000 for 2...

3.-
Now we change in the expression of the interest rate. Here it is not expressed on an annual basis, but for a specific period of time. Calculate the simple commercial interest of:
(a) $45,000 for 2 years 7 months 10 days at 2.15% quarterly.
b) $38,400 for 9 months 25 days at 1.25% per month.

Note:

The original exercise is in the image, it is in Spanish, but it is easy to understand.

Another note:

Please put the procedure explained, thank you very much for your attention bartleby expert!

Extracted text: 3. Ahora cambiamos en la expresión de la tasa de interés. Aquí no se expresa de manera anual, sino por un período de tiempo específico. Calcular el interés simple comercial de: a) $45,000 durante 2 años 7 meses 10 días al 2.15% trìmestral b) $38,400 durante 9 meses 25 días al 1.25% mensual