General Product Incorporated distributed $100$ million coupons in $2024.$ The coupons are redeemable for $30$ cents each. General anticipates that $70\%$ of the coupons will be redeemed. The coupons expire on December $31,2025.$ There were $45$ million coupons redeemed in $2024$ and $30$ million redeemed in $2025.$ General recognizes coupon expense in the period coupons are issued.

What was General's coupon liability as of December $31,2024?$

Multiple Choice

$$21\mathrm{.}0$ million

$$13\mathrm{.}5$ million

$$16\mathrm{.}5$ million

$$7\mathrm{.}5$ million