Find two rational number between -2/3 AND 1/2 IN DEcimal representation

Asset aquired & put to use for less than 180 days in previous year and subsequently sold during the same previous year. Will dep. allowed?

I have filled GST 3B return of AUGUST 2017 by 3 days late. SO they levied Rs. 600 late fees . While making payment of late fees , I insert the figure in PENALTY head instead of FEES head. Which is the correct head in challan to pay LATE FEES?

And how can we take credit of PENALTY head cash balance in cash ledger ?

What is sin(a+b)