Answer:
Answer: 71.4%
Explanation:
First, we need to find the interest charged on the loan by subtracting the original amount of the loan from the total amount paid back: $840 + $50 = $890
Next, we need to find the interest rate as a percentage of the original loan amount: ($50 / $840) * 100% = 5.95%
Now, we need to annualize this interest rate by multiplying it by 12: 5.95% * 12 = 71.4%
Therefore, the annual interest rate on this payday loan is equivalent to 71.4%.