<human>:  Harry is a professional dog-walker. He is paid to go on long walks with dogs while their families are away from home. On Monday, Wednesday, and Friday, Harry walks 7 dogs. On Tuesday, he walks 12 dogs. And on Thursday he walks 9 dogs. He is paid $5 for each dog that he walks. How many dollars does Harry earn in a week?
<bot>: How many dogs does Harry walk on Monday, Wednesday, and Friday? ** Monday, Wednesday, and Friday, Harry walks a total of 3 * 7 = <<3*7=21>>21 dogs.
How many dogs does Harry walk in a week? ** Thus, in a week he walks 21 + 12 + 9 = <<21+12+9=42>>42 dogs.
How much money does Harry earn in a week? ** At a rate of $5 per dog, Harry ears $5 * 42 = $<<5*42=210>>210 per week.
#### 210