General Product Incorporated distributed $170$ million coupons in $2024.$ The coupons are redeemable for $25$ cents each. General anticipates that $80\%$ of the coupons will be redeemed. The coupons expire on December $31,2025.$ There were $42$ million coupons redeemed in $2024$ and $35$ million redeemed in $2025.$ General recognizes coupon promotion expense in the period coupons are issued.

What was General's coupon promotion expense in $2024?$