To calculate the finance charge for April, we use the formula:
$\text{Finance Charge} = \text{Average Daily Balance} \times \left(\frac{\text{Annual Interest Rate}}{12}\right)$

Step 1: Compute the monthly interest rate.

$\text{Monthly Interest Rate} = \frac{20.1\%}{12} = 0.201 \div 12 = 0.01675 \text{ (or 1.675\%)}$

Step 2: Compute the finance charge.

The given Average Daily Balance is $790.32$. Using the formula: $\text{Finance Charge} = 790.32 \times 0.01675$

$\text{Finance Charge} = 13.23986$

Step 3: Round to two decimal places.

The finance charge for April is: $\boxed{\$13.24}$

Let me know if you would like further details or have questions!

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Related Questions:

1. How is the average daily balance method different from other interest calculation methods?
2. What would the finance charge be if the annual interest rate were 18% instead of 20.1%?
3. How can paying earlier in the month impact the finance charge?
4. If you made no payments, how would the finance charge change?
5. Can you explain how purchases affect the average daily balance?

Tip: To minimize finance charges, pay off as much of the balance as possible before the billing cycle ends.