6 roses for $2.45 each.
6×2.45 = $14.70
12 carnations for $0.99 each.
12×0.99 = $11.88
9 tulips for ???
in total the price is $40.08 (incl. the tulips).
40.08 = 14.7 + 11.88 + 9×???
13.5 = 9×???
??? = $1.50
so, each tulip costs $1.50
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