Christopher earned $78 at his job when he worked for 2 hours. What was his hourly pay rate in hours per dollar?

Christopher earns $39 per hour.

Step-by-step explanation:

Divide 78 by 2 to figure out how much Christopher earned in one hour.

78 divided by 2 = 39

He earns $39 per hour. (I assume that's what you mean by "hourly pay rate in hours per dollar")

Christopher's hourly pay is $39/hour.

Unit rate = divide numerator (78) by denominator (2)

It would equal: 39/1