The op-amp of figure has a very poor open loop voltage gain

The op-amp of figure has a very poor open loop voltage gain of 45 but is otherwise ideal.
The gain of the amplifier equals:

A closed loop gain,

A_CL =	V₀	=	A_OL
	V_i		1 + A_OL

where, A_OL = 45 (given)

β =	2k	(from given figure)
	2k + 8k

or β = 0.2

Now, A_CL =	45
	1 + 45 × ·2

=	45	= 4.5
	10