Answer:
Her adjusted balance is 46.893,4 dollars.
Explanation:
US rule does not allow calculations of interest on interest and is generally applied when there is a delay between first payment and taking of loan. Time between these two in our case is 40 days, therefore paid interest is 3000*0,08*40/90 equals to 106.6 dollars. This means that her total payment after 40 days are 3106.6 dollars. Her remaining part to be payed according to the rule is 50.000 - 3106.6 dollars or 46.893,4 dollars.