book Maths Puzzle Numerical Ability

FIND THE COST PER UNIT DURING A WEEK WHEN THE TOTAL COST WAS 68,000, THE NUMBER OF UNITS PRODUCED WAS 500, AND THE FIXED COSTS WERE 8000. USE THE FORMULA T=U TIMES N+F, WHERE T IS

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425/604=425*100/604=70.36% and 230/344=230*100/344=66.86%
when compared 70.36%>66.86%

is there a way to increase the validity of my findings? Angle ABC and angle DEB are vertical angles. Angle ABC = (4x + 50) degrees, and angle DEB = (2x + 60) degrees. Find x.