Assume the following information:

Actual run time this week $?$ minutes

Machine time available this week $5,000$ ?minutes

Actual run rate this week $?$ units per minute

Ideal run rate $4\mathrm{.}0$ ?units per minute

Defect $-$ free output this week $15,000$ ?units

Total output this week $($ including defects $)?$ units

If the efficiency rate is $0\mathrm{.}40,$ ?then the actual run rate this week is closest to: