For an assembly line, the production rate was $4$ pieces per hour and the average processing time was $60$ minutes. The $\text{WIP}$ inventory was calculated. Now, the production rate is kept the same, and the average processing time is brought down by $30$ percent. As a result of this change in the processing time, the $\text{WIP}$ inventory
- decreases by $25\%$
- increases by $25\%$
- decreases by $30\%$
- increases by $30\%$