Sahana puts $25 in her kiddy box on her every birthday. She started doing this since when she was twenty years old. But every year on January 1st her sister will take $5 from Sahana's kiddy box with out knowledge of Sahana. Sahana died after celebrating her sixty years birthday. Her sister opened the box after her death to find only $50 in the box. How is it possible?
She was born on 28th feb
She was born on 30th feb
She was born on 29th feb
In 40 years Sahana put 10(as her birthday comes once in 4 years)*25 = $250
Her sister withdraws 40*5 = $200
Thus the remaining amount is $50.
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