By Alex Lang New York (Knewz) — Might want to cancel a few subscriptions. Americans dramatically underestimate how much they spend on monthly subscriptions — to the tune of more than $100. People estimated they spend $86 on monthly subscriptions, but in reality, the average figure was close to $219. That is a difference of $133, a new study from C+R Research found. Subscriptions range from streaming-television providers to clothing boxes. At $220 a month, the figure is adding up for the average American. The survey found that only 24 percent of people had an estimate within $25 of their actual…