Broken glasses

Raji requested her friend  Mary to spare her 100 glass cups for the birthday party.

Mary sent them through her servant boy.

To ensure safe delivery of the cups, Mary offered him 3 paise for

every glass delivered safely and threatened to deduct 9 paise for every  glass he breaks.

On settlement, the boy received  Rs. 2. 40 from Mary.

How many glasses did he break?


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