Answer: $31.50 for the four brushes after using the coupon
Explanation:
$10.50 (Amount for EACH brush) * 0.75 (coupon 25% off) = $7.875 (Amount for each after coupon)
$7.875* 4 brushes = $31.5
or
$10.50 (regular price) * 4 brushes = $42 (4 brushes at regular price)
$42 * 0.75(25% coupon) =$ 31.5