Camera Sale!

$400 x 0.30 = 120...Then $120 + $280 = $400, then the should be 0.30 = 30%

This one's simple:

$280 (the price of the camera now) $400 (the original price of the camera)

$400-$280=$120

$120/$400=0.30 or 30%

Discounted amount = 400-280 = 120
Per cent means "per hundred".

That's 30 dollars off "per hundred" dollars of the original price(4 * $100), or 30% off.

The camera has been discounted to $280 from $400.
Hence discount of 120 on 400.
Converting into percentage it works out to be 120/400=.30 or 30%.

Percentage reduced={ (400 - 280)/ 400 } × 100 => 30 %

280/400 =70% So discount= 100-70 = 30%

{100$ x (400-280) }/400$=30%

Discount%= (400 - 280)x100/400 = 120/4 = 30 %

P - D = F, where P is the original price; D (discount) = Pd, where d is the discount rate; F is the final price.

400 - 400d = 280 d = 0.3; therefore, discount rate is 30%.

$\begin{aligned} \$400 &= 100\%\\[1ex] \$4 &= 1\%\\[1ex] \$20 &= 5\%\\[2ex] \$400-\$280 = \$120 &= 30\% \end{aligned}$