You are depositing Rs. 3 in First day and Rs. 3 in Second day in your account.
And you are withdrawing Rs. 4 from your account in Third day.
You do this repeatedly. When soon do you have Rs. 60?
I will have 2 Rs. at the end of 3days.
So i will be able to collect Rs.54 at the end of 81 Days
Now i will add 6 Rs. in the next 2 days and i will reach Rs.60.
So i will have Rs.60 in 83 Days