Final answer:
The nominal annual rate of interest for the given annuity due is 10%.
Step-by-step explanation:
The nominal annual rate of interest can be calculated using the formula:
Rate = ((Future Value - Present Value) / (Present Value))^(1 / Number of Periods) - 1
Applying this formula to the given annuity due:
Rate = (($4200 - $380) / $380)^(1 / (4 * 15)) - 1
Rate = ($3820 / $380)^(1 / 60) - 1
Rate = 10%