 
<translate> Don kula da karnukansa 20, Mr. Sean ya caji Khalil 20 * $60 = $1200. Khalil kuma ya biya $40 * 60 = $2400 ga Mr. Sean don kula da kuliyoyinsa. Gabaɗaya, Khalil ya biya Mr. Sean $2400 + $1200 = $3600 don kula da dabbobinsa. To, amsar ita ce 3600. <eng> To treat his 20 dogs, Mr. Sean charged Khalil 20 * $60 = $1200. Khalil also paid $40 * 60 = $2400 to Mr. Sean to treat his cats. Altogether, Khalil paid Mr. Sean $2400 + $1200 = $3600 to treat his pets. So, the answer is 3600. 