12 cats are $989687356656310605403 how much money is it for 15 cats,171 cats and lastly 98989898989898889 cats.
(All these cats are for 20 countries in this question, they arent all for 1 person)
Given your problem, we need to set up a price per cat. If 12 cats costs $989687356656310605403, then each cat costs
989687356656310605403/12 = $82473946388025883783.583333333. Therefore, if you want to find the price of X cats you simply multiply the price of one cat times X.
(eg) 25 cats costs $82473946388025883783.583333333*25 = $2,061,848,659,700,647,094,589.58 or 2 sextillion USD which is more money than all of the money in all of the worlds economies combined. Man those are expensive cats!