I am trying to create a spreadsheet that allows me to assign a predetermined
number to a specific set of numbers.
(This is to help me with automation of grading students.)

There is a predetermined grid we must follow that has an x axis zero to 10
The y axis is zero to 50.
The rest of the grid tells the proper grade that a student would get is they
score specific numbers. For example a 50 and a 10 would be a 100%, a 45 and
a 7 would be another number like a 83%

I want to be able to enter the 2 (X and Y grid) numbers for students and
have excel calculate the proper percentage score using the grid information
that I would also enter.

So if a student received a 37 and an 6 or any other set of two numbers-
excel would automatically enter the final grade in a separate cell.

Is this an IF statement? What is the easiest way to approach this?

Thank you!