That's quite normal for a whole motherboard replacement
Burnt CPU means the whole motherboard is unsalvageable as all laptop nowadays comes with the CPU soldered to the motherboard unlike the old days where you can just replace the CPU because it's socketed instead of soldered

As other have suggested, save your money for a new laptop instead
Motherboard replacement will only get you an additional 1 ~ 3 months warranty from the shop whereas compared to a new laptop, you will get between 1 to 5 year of manufacturer's warranty depending on what model you buy and which warranty you subscribe to

This post has been edited by sHawTY: Oct 24 2023, 05:21 PM