$70-x%-30%=36.75

item is $70 disocunted by unknown percentage, discounted an additional 30% equals $37.75
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The first discount changes the price by the factor 1-x/100. So the new price is 70(1-x/100). A further discount of 30% reduces the price to 70%, or 0.7, of what it was. Therefore, 70(1-x/100)*0.7=36.75. 1-x/100=36.75/49=0.75. x/100=1-0.75=0.25, and x=25%. Check: 25% of $70=$17.50. 70-17.50=$52.50. 30% of 52.50=$15.75, making $36.75.

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