James earns $20 an hour while working at his main job. He earns 20% less while working his second job. He works 30 hours at his main job and half that much at his second job. How much does he earn per week?
Let’s work this out in a step by step way to be sure we have the right answer.
840
James earns 20 *.

2 = $4 less while working his second job.

So he earns 20 - 4 = $16 an hour.

At his first job he earns 20 * 30 = $600.

He works 30 / 2 = 15 hours at his second job.

So he earns 15 * 16 = $240.

So he earns 600 + 240 = $840 a week.

.

So, the final answer is 840