The price of a usb memory stick selling at a 21% discount off its marked price (m) is

I believe it would be .21m. So for example.The memory stick is sold normally for $14, so to plug it into the equation it would be: .21(14), which gives you the discount of $2.94. Subtract that amount from the original price, and that gives you the sale price. .21(14)=2.94    14-2.94=11.06Sale price

Then just do it (lol)

Two because two of one thing is two.