Answer:
2000 colones
Step-by-step explanation:
From the given information presented in the question.
Your friend named Teresita who's from El Salvador showed you her parent's old currency which is valued = 2000.
Those bills used to be his country's official currency before the U.S. Dollar became its present official currency.
Let's Recall that ; it was in year 2001 that the government leaders in El Salvador make a move on adopting U.S Dollar as their present official currency.
Before that time, the currency spent in El Salvador is known as Colones which is used to honored an important sailor who arrived in or on the American continent centuries ago.
Thus ; from the text information and what we learned from the lesson, the currency the text referring to is 2000 colones.