The total after discound and tip is $25.5
Explanation:The bill Kieran's mother gets is $25
Because she has a coupon for 15% off
15% of $25 is:
0.15 * 25 = 3.75
Subtracting this discount from the bill, we have:
$25 - $3.75
= $21.25
She adds 20% as tip after the discount is applied
20% of $21.25 is:
0.2 * 21.25 = 4.25
Adding this to the amount after discount, we have:
$21.25 + $4.25
= $25.5
