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Use the simple interest formula I=prt, where I is the interest, p the principal, r the annual interest rate, and t the time in years.
$140
If we borrow money from a bank, we pay the bank interest for the use of their money. Similarly, if we have an unpaid balance on a credit card, we also pay interest to the credit card company. To calculate the interest I, we use the simple interest formula.
I= p r t, where...
I& =Interest
p& = Principal
r& = Annual interest rate
t& = Time (in years)
The simple interest paid is $ 140.