20 yr old girl

IAS ke exam ka saval...
.
1 ladki ne 20 saal ki umar mei 1 box kharida
wo apny har brthdy pe us mei Rs.250 daal deti
or
uski behen us me se Rs.50 apny har brthdy pe nikal leti,
ladki ki death 60 saal me huyi,
jab box khula to us me se srf Rs.500 nikly Q??
Its a challenge 4 u& ur frnds

Answer: ladki ka bdy  29th Feb