The amount that Theresa was charged in interest for the billing cycle is $5.30
<h3>How to calculate the interest?</h3>
By using the average daily balance, the amount will be:
= (350 × 12) + (520 × 19) / (12 + 19)
= (4200 + 9880)/31
= 454.19
Therefore, the interest will be:
= (454 × 0.14)/12
= $5.30
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