Answer:
The total price of the groceries, including discount and tip is $110.4.
Step-by-step explanation:
Here, the bill amount of groceries = $120
Now, the coupon off = 20%
Calculating the discount, we get
20% of bill amount $120 = 20% of 120 = 
So, the 20% discount on the bill amount = $24
The actual payable amount = Bill Amount - Discount
= $120 - $24 = $96
Now, 15% tip is also applied on the actual payable amount $96.
15% of 96 = 
So, the total price t = Payable amount + Tip amount
= $96 + $14.4 = $110.4
or, t = $110.4
Hence, the total price of the groceries, including the discount and the tip is t = $110.4.