Question
PSLE
A biscuit costs $1.40 in Bakery C. For every 3 biscuits a customer buys, he can buy the fourth one at half the price. What is the greatest number of biscuits that a customer can buy with $21?
3 m

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PSLE
A biscuit costs $1.40 in Bakery C. For every 3 biscuits a customer buys, he can buy the fourth one at half the price. What is the greatest number of biscuits that a customer can buy with $21?