John want to buy a $100 Trouser at the store, but he think it’s too expensive. Finally, it goes on sale for $40. What is the percent decrease? Select the correct option:
A) 20%
B) 30%
C) 40%
D) 70%
E) 60%
The is always the difference between our starting and ending points. In this case, it’s 100 – 40 = 60. The “original” is our starting point; in this case, it’s 100. (60/100)*100 = (0.6)*100= 
<gadget id="calculator">(0.6)*100</gadget>
<output>60</output>
60%.   60%
<result>E</result>
John want to buy a $100 Trouser at the store, but he think it’s too expensive. Finally, it goes on sale for $40. What is the percent decrease?