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.