 
 <translate> Give the step-by-step reasoning process and then the final answer. Greg has his own dog walking business. He charges $20 per dog plus $1 per minute per dog for walking the dog. If he walks one dog for 10 minutes, two dogs for 7 minutes and three dogs for 9 minutes, how much money, in dollars, does he earn? <ibo> Kwuo otú e si atụgharị uche n'isiokwu ahụ, kọwaa nke ọ bụla n'ime ha, ma kwuo ihe bụ azịza ya. Greg nwere azụmahịa nke ya nke ịga na-eme ka nkịta ya na-agagharị. Ọ na-ana dọla 20 maka nkịta ọ bụla tinyere dọla 1 kwa nkeji maka nkịta ọ bụla ọ na-eme ka ọ na-agagharị. Ọ bụrụ na ọ na-eme ka otu nkịta na-agagharị agagharị ruo nkeji iri, abụọ ruo nkeji asaa, atọ ruo nkeji itoolu, ego ole ka ọ na-akpata? 