Solve the following expression$30\times12\times(-5)\times40$

Given:

$30\times12\times(-5)\times40$

To do: Solve the expression.

Solution:

$30\times12\times(-5)\times40$

=$360 \times - 200$                             [$+  \times  -  =  -$]

=$- 72000$

$30  \times  12  \times   -5   \times   40  =  -72000$