The budgetary process (BPP 2019/2020) Question 10b.9

Sir, can you explain this small part of this question? I am confused about how they got this particular value.

A company manufactures a single product, M. Budgeted production output of product M during August is 200 units. Each unit of product M requires 6 labour hours for completion and PR Co anticipates 20 per cent idle time. Labour is paid at a rate of $7 per hour. What is the direct labour cost budget for August?

The answer to this question state that the allowance for idle time (20% of total time = 25% of active time). How do they calculate 25% of the active time?

Thank you so much