Farm Machinery

The Performance Index ($PI$) of an agricultural machine is defined by the formula:

Options:

• (A) $PI = \frac{a \times q \times \eta}{p}$
• (B) $PI = \frac{p \times \eta}{a \times q}$
• (C) $PI = a \times q \times p$
• (D) $PI = \frac{\eta}{a \times q}