Hello, I need to make an op amp circuit that calculates the grade for a subject, where there are 4 types of grade 35% 10% 20% and 35%, within each percentage it is 0-100 points, so I plan to do this :

100%=10mV

Input 0-10mV output 0-3,5mV

Input 0-10mV output 0-1mV

Input 0-10mV output 0-2mV

Input 0-10mV output 0-3,5mV

How can I calculate the values of the resistors so that it gives me the value that I require? and the type of opamp?

Mod: cleaned up your image.

100%=10mV

Input 0-10mV output 0-3,5mV

Input 0-10mV output 0-1mV

Input 0-10mV output 0-2mV

Input 0-10mV output 0-3,5mV

How can I calculate the values of the resistors so that it gives me the value that I require? and the type of opamp?

Mod: cleaned up your image.

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