Write a function float final grade (float g1, float g2) that counts the grade g1 of Coursework 1 for 20% and the grade g2 of Coursework 2 for 80% and returns the final grade. All grades are in the range 0-100, and the function should print "ERROR\n" and return -1.0 if any of its arguments is outside this range. Answer: (penalty regime: 10, 20, ... %)

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