Yes, when my mother travels to Argentina, in Peru I change soles to dollars in the bank and when I arrive in Argentina I change dollars to Argentine pesos.

2) When do people generally use cash? When do they usually use credit cards

Use cash when shopping at the market, or basic necessities and credit cards when buying appliances or offers in supermarkets.

1.Change the national currency to foreign because I had to make a payment in dollars to the bank.

When do people generally use cash? When do they usually use credit cards?

1.People use cash when they go to the supermarket, although they also usually pay with a credit card.