
Arun, Varun and Tarun, if working alone, can complete a task in $24,21$, and $15$ days, respectively. They charge Rs. $2160$, $2400$, and Rs $2160$ per day, respectively, even if they are employed for a partial day. On any given day, any of the workers may or may not be employed to work. If the task needs to be completed in $10$ days or less, then the minimum possible amount, in rupees, required to be paid for the entire task is
- $38400$
- $38880$
- $34400$
- $47040$