John want to buy a $100 Trouser at the store, but he think it’s too expensive. Finally, it goes on sale for $10. What is the percent decrease?	Choose the correct choice from the following options: A) 90% B) 30% C) 40% D) 70% E) 80%
The is always the difference between our starting and ending points. In this case, it’s 100 – 10 = 90. The “original” is our starting point; in this case, it’s 100. (90/100)*100 = (0.9)*100= 
<gadget id="calculator">(0.9)*100</gadget>
<output>90</output>
90%.   90%
<result>A</result>
John want to buy a $100 Trouser at the store, but he think it’s too expensive. Finally, it goes on sale for $10. What is the percent decrease?