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After David receives a 20% raise in salary, his new salary is $27000. What was his old salary?

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1 Answer

Taylor--
 
If the new salary of 27000 is 20% (or 0.20) MORE than his old salary, then
we can say his new salary is 120% of his old salary (the original 100% plus the extra 20%).  Therefore, letting his old salary be denoted as x, we have:
 
1.2x = 27000
x = 27000/1.2 = 22500.
 
Therefore, David's original salary was $22,500.
 
(And easy way to check this?  20% of 22500 is 4500.  Adding that to 22500:  (22500 + 4500 = 27000).  )