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The correct answer is:
A. David ha abierto la lata.
"David ha abierto la lata", is the best Spanish equivalent to, "David has opened the can".

Answer:
420.00
Explanation:
Gross amount = Amount with tax
Net amount = Amount without tax
Gross amount = Net amount + 20% × Net amount
(1 + 20%) × Net amount
(1 + 20%) × 350
(100% + 20%) × 350
120% × 350
120/100 × 350
1.2 × 350 = 420
Added tax = Gross amount - Net amount
= 420 - 350 = 70
8; ayudaste
9; regresamos
10; ganó
11; necesitamos
12; pasaron
13; limpie
14; escuchó
15; usaron
16; calificarán
17; pintaremos
18; planchó
19; lavo
20; terminamos
hope this helped ;) !!