Answer:
10.5%
Step-by-step explanation:
From the information provided in the question it seems that the amount of interest that Mrs. Smith is currently paying is that of 10.5%. This can be calculated by dividing the total interest paid by the mortgage amount, and then multiplying by 100 in order to turn the decimal into a percentage. Like so
$6,090 / $58,000 = 0.105
0.105 * 100 = 10.5%