X/2-14=-20 I tried on this one but I failed.
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The shirts are 12.75 for 3 so we can write a ratio of 
To get the price of the shirts, one needs to divide , which will tells use what the unit price is per shirt. The price per shirt is $4.25
Let Benny's salary = $ K
But kenny earns 142% of Benny's Salary
So, Kenny's salary = 142%of K
Kenny's salary =K
Kenny's salary = 1.42K
Kenny's income exceeds Benny's by =1.42K - K =$0.42 K
% by which Kenny's salary exceeds by Benny's =
% by which Kenny's salary exceeds by Benny's = 42%