 
<translate> Dog guda ɗaya shine $ 20 + (minti 10 * $ 1 a minti) = $ 30. Karnuka biyu sune 2 * ($ 20 + (7 mintuna * $ 1 a minti)) = $ 54. Karnuka uku sune 3 * ($ 20 + (9 mintuna * $ 1 a minti)) = $ 87. Jimlar ita ce $30 + $54 + $87 = $171. Amsar ƙarshe: 171. <eng> 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. 