He started it.

Well, then we certainly can't stop.

A 1% 9.09kΩ resistor in parallel with a 1% 90.9Ω resistor gives exactly 90.0000Ω ±1%.

 

Hello ,
I have a current sensor with a ratio of 1:1000 for a current of 0-50 A, I want to make a circuit to capture the current value and send it to the input of a microcontroller ATMEGA 328, how I can convert the signal from 0-50 mA to 0-4.5V using LM324 amplifier or other components? (Emphasis added)

Since the input is AC and it needs to be offset to fit between 0V and 4.5V DC.

 

It was also mentioned that the output of the I to V converter connects to a MCU.
Current transformers (if that is what it is) can produce a large output voltage at quite low impedance if there is a surge or inrush current, more than enough to zap the input of the MCU. Some protection circuitry is needed - even if it just a series resistor and a couple of clamp diodes to the supply.
Also if we are talking about an old-fashioned passive CT then the output is bipolar. Either it must be biassed to half supply or rectified (as per @crutschow, post #10) before connecting to the MCU.

 

I missed it, but @crutschow has what looks like a complete solution in his post #10.