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kelly spends $ 77.79 on items for a party . she buys thank you cards that cost $ 7.79 ( including tax ) . she also buys gift bags that cost $ 10.00 each . if she buys one gift bag for each guest , how many guests did kelly invite to the party ?

a ( 10
b ( 7
c ( 5
d ( 8

kelly spends 7779 on items for a party she buys thank you cards that cost 779 including tax she also buys gift bags that cost 1000 each if she buys one gift bag class=