A store owner borrowed $\$ 39,000$ at $10 \%$ from a bank to buy more inventory. Given that the loan is for 21 months, find the interest and the maturity value. The interest is $\$ \square$. The maturity value is $\$ \square$.

Step 1 ：\(I = P*r*t\)

Step 2 ：\(I = $39,000 * 0.10 * 1.75\)

Step 3 ：\(I = $6,825\)

Step 4 ：\(M = P + I\)

Step 5 ：\(M = $39,000 + $6,825\)

Step 6 ：\(\boxed{M = $45,825}\)