2. You invest $\$ 15000$ at $3 \%$ per annum, simple interest. After 4 years, what is the amount in your account?

Step 1 ：Calculate the simple interest using the formula: \(I = P * R * T\)

Step 2 ：\(I = 15000 * 0.03 * 4\)

Step 3 ：\(I = 1800\)

Step 4 ：Add the interest to the principal amount to find the final amount: \(A = P + I\)

Step 5 ：\(A = 15000 + 1800\)

Step 6 ：\(\boxed{A = 16800}\)