Kyle paid $120 for an iPod nano during a 20%-off sale. What was the regular price?

x= reg. price
reg. price - 20% = sale price.
x - .20x =120

.80x/.80 120/.80

x=$150

(Now my teach explained this in class and got that answer But I don't understand how he got .80x? can someone please explain?)

Question

Kyle paid $120 for an iPod nano during a 20%-off sale. What was the regular price?

x= reg. price
reg. price - 20% = sale price.
x - .20x =120
 
.80x/.80 120/.80

x=$150

(Now my teach explained this in class and got that answer But I don't understand how he got .80x? can someone please explain?)

anonymous · Answer

ok
so when u reduce the price of a product by 2 percent, essentially, what are you doing?

electrochika · Answer

100 - .20 = .80

anonymous · Answer

oh subtracting.

but where did the 100 come from? x?