Question 393170
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Hi
10% discount with an additional 15% is taken off the discounted price
Let x reprsent the original price
 Note: 10% off is the same as paying 90% of original price
       15% off is the same as paying 85% ...
Question states
  .85(.90x)= $306
         x = $306/(.85*.90) = $400

CHECKING our answer
 .90*$400 = $360
 .85*$360 = $306

Note: expanding on basic concepts such as 'double discounts' is typical of
the type of questions one may see in the math portion of a college entrance exam