Explanation:
From the given options the correct choices are
1.Each shirt costs $20.
Because x times 20 will give the cost of the 20 shirts
2.The cost of a shirt with tax is $21.30.
Note: tax is 6.5%, so 6.5% of $20 must be added to the cost of the shirt
=(6.5/100)*20
=0.065*20
=1.3
=20+1.3
=$21.3