 <translate> Single dog is $20 + (10 minutes * $1 per minute) = $30. Two dogs are 2 * ($20 + (7 minutes * $1 per minute)) = $54. Three dogs are 3 * ($20 + (9 minutes * $1 per minute)) = $87. The total is $30 + $54 + $87 = $171.
The final answer: 171. <yor> Owó tí wọ́n ń san fún ajá kan ṣoṣo jẹ́ $20 + (10 ìṣẹ́jú * $1 fún ìṣẹ́jú kan) = $30. Ajá méjì ni 2 * ($20 + (7 ìṣẹ́jú * $1 fún ìṣẹ́jú kan)) = $54. Ọja mẹ́ta jẹ́ 3 * ($20 + (9 ìṣẹ́jú * $1 fún ìṣẹ́jú kan)) = $87. Àpapọ̀ rẹ̀ jẹ́ $30 + $54 + $87 = $171. Ìdáhùn tó gbẹ̀yìn ni pé: 171. 