The cost of first-class postage in the united states increased approximately 5.4% in january of 2006 to 39 cents. what was the pre- january cost of the first-class stamp? round your answer to the nearest penny.

d. $0.37

Step-by-step explanation:

Let x be the pre-January cost of first class postage.

We have been given that the cost of first-class postage in the United States increased approximately 5.4% in January of 2006 to 39 cents.

This means that x plus 5.4% of x is equal to 39 cents ($0.39). We can represent this information in an equation as:

Let us solve for x.

Therefore, the pre-January cost of the first class stamp is $0.37 pennies and option d is the correct choice.