What Does a $100 Online Payment Actually Cost a Business?
A $100 online sale rarely puts $100 in a business's account. See how processing fees work, what Stripe, PayPal and Square charge, and where the money goes.

The stories, science, and small details behind the things we use every day.
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A $100 online sale rarely puts $100 in a business's account. See how processing fees work, what Stripe, PayPal and Square charge, and where the money goes.

Salary calculators often use 2,080 hours for a full-time work year. Here is where that number comes from, when it is useful, and why actual yearly work hours can be very different.
Some loans calculate interest using 360 days even though a calendar year has 365 or 366. The reason lies in financial day-count conventions such as 30/360 and Actual/360.
Why does your mortgage balance fall so slowly at first? Learn how principal, interest, and amortization split each payment and change over time.
