so find out how much of your currency is needed to be equal to 1 US American dollar, and that is one ad,
EX: Country: Mexico
Currency: Peso
Pesos Amount = 1 USAdollar (AKA 1 ad) : 10-13 Mexican Pesos.
for some countries that don't have a currency that is close to the dollar value (Euro close enough and only one i could think) Donating might hurt your pocket. cause of currency values.