A customer uses their Charles's Sport Shop credit card to charge a treadmill at Charles's Sport

Shop. The price is $$720$ and the interest charge is $20\%$ per annum if the bill is NOT paid in $30$ days.

The customer fails to pay the bill within $30$ days and interest is added to the customer's account.

What is the amount of the interest?$($Use $365$ daysfor calculation.$)$

$$24$

$$144$

$$12$

$$5$