Solve the problem. Assume that simple interest is being calculated in each case. Round your answer to the nearest cent.

Allan borrowed $\$ 6300$ from his father to buy a car. He repaid him after 4 months with interest of $2 \%$ per year. Find the total amount he repaid.

Step 1 ：Calculate the simple interest for 4 months at a rate of 2% per year on a principal amount of $6300

Step 2 ：Principal \( P = \$6300 \)

Step 3 ：Rate \( r = 0.02 \) per year

Step 4 ：Time \( t = \frac{4}{12} \) years

Step 5 ：Interest \( I = P \cdot r \cdot t \)

Step 6 ：Interest \( I = \$6300 \cdot 0.02 \cdot \frac{4}{12} \)

Step 7 ：Interest \( I = \$42.00 \)

Step 8 ：Total repayment \( = P + I \)

Step 9 ：Total repayment \( = \$6300 + \$42.00 \)

Step 10 ：Total repayment \( = \$6342.00 \)

Step 11 ：\( \boxed{6342.00} \)