Answer:
C)  The estimated volume of the box  is 378 sq cm.
Step-by-step explanation:
Here, length of the box  =  7.2 cm
Width of the box  = 6.1 cm
Height of the box  =  8.9 cm
Now, if the number is of the form a.b
If b  <  5, the number is rounded off to a.
If b ≥  5, the number is rounded off to (a+1).
Hence, 7.2 is rounded off to  7.  (as 2< 5)  ⇒ L'  = 7 cm
      6.1 is rounded off to 6. (as 1< 5)  ⇒  W'  = 6 cm
      8.9 is rounded off to 9.  (as 9 > 5) ⇒ H'  = 9 cm
Now, the volume of the box = L'x B' X H'
= 7 cm x 6 cm x 9 cm
= 378 sq cm
Hence, the estimated volume of the box  is 378 sq cm.
