Answer :
by rounding 842 to 800, she can multiply 800 by 3 to get 2,400.
then, multiply 40 by 3, you get 120 and add the two together to get 2,520
this shows her answer is not necessary reasonable
then, multiply 40 by 3, you get 120 and add the two together to get 2,520
this shows her answer is not necessary reasonable