#### Answer

2100 dollars is due on the student loan.

#### Work Step by Step

The interest formula is:
interest due = principal $\times$ yearly rate of return $\times$ time in years.
This formula can be written as i = P $\times$ r $\times$ t.
P = 10,500
r = 5% = 0.05
t = 4
Substitute these values into the equation to obtain:
i = 10500 $\times$ 0.05 $\times$ 4
i = 42000 $\times$ 0.05
i = 2100
2100 dollars is due on the student loan.