Question 1196291
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Let assume that his salary is 40x.


Then he spent  {{{(1/5)*40x}}} = 8x  and  {{{(1/8)*40x}}} = 5x, 

or, in total,  8x+ 5x = 13x.


So, he has left  40x - 13x = 27x.


It gives an equation

    27x = 1431,


and we find  x = 1431/27 = 53.


Hence, his salary is  40*53 = 2120 dollars.    <U>ANSWER</U>
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Solved.