Jason buys clothing during January and July when the prices are lowest. If he spends a total of $600, how much should he set aside each month for clothing?
We don't know how much he spends in January or how much he spends in July, but for the year he spends $600, which is to say that for 12 months he saves $600 to spend on clothes.
$600 / 12 months = $50/month