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Which of the following examples have a constant rate of change?

An electrician earns $50 the first hour plus $35 for every additional hour.

You are making meatballs and roll out 30 meatballs the in a half hour and then another 30 meatballs in the next 20 minutes.

The number of bacteria triples every hour.

The money you put in the bank earns 2% interest. This means that the bank pays you 2% of the amount of the money kept in the bank each year.