Question

A key role of the moneychangers was to help

Answer 1

A key role of the Money changer was to help, in the exchange of one type of coin for another from different places through Merchants.  

A Money changer may be a person or an association, whose profession is the exchange of money or currency of one nation, for that of another. Money changers helped the merchants of foreign nations to acquire the local coins or currency of that country to continue their business.

Answer 2

ANSWER:

To help Traders from various regions exchange one kind of coin to another.

EXPLANATION:

A key job of money changers was to help Merchants from better places trade one sort of coin to another.

In those days, money changer normally exist in each harbor of each city. Brokers from an outside nation came to cash changers to gain the nearby coin (which in those days is a type of money) to do their organizations in that nation