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 ?
"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 = 60 % . e"
subtract(100, 40)