Subject :IMO Class : Class 5
Shanu prepared 448 cards for mailing. To prepare each card, it took him about 8 seconds
to put each card into an envelope and 9 seconds to seal, label and stamp each envelope.
Which is closest to the total amount of time it took Shanu to prepare the cards?
A 7000 seconds
B 8000 seconds
C 9000 seconds
D 10000 seconds