As we know that,
1/4 = 0.25
3/4=0.75
1/2=0.5
Rajni spent 10.25 rupees in canteen
Rajni spent 25.75 rupees to buy a gift
Rajni spent 16.5 rupees to her friend
Total money spent by her = 10.25 + 25.75 + 16.5 = 52.5 rupees
Total money spent = Total money at the beginning
So Rajni had 52.5 rupees at the beginning