Question
PSLE
First 5 puffs: $1 each
Additional puffs: 90¢ each.

Mark has $9. What is the greatest number of puffs he can buy?
2 m

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PSLE
First 5 puffs: $1 each
Additional puffs: 90¢ each.

Mark has $9. What is the greatest number of puffs he can buy?