The camera Melissa wanted for her birthday is on sale at 21% off the usual price. The amount of the discount is $79.80. What was the original price of the camera?
In this task, we use the ratio. If amount of the discount is $ 79.80, the original price is much higher than the discount. Therefore, arrange the appropriate ratio as below and multiply on the cross: y --> price (original) x --> amount of discount 0,21x ----- 79,80$ x ----- y 0,21xy = 79,80x |:x 0,21y=79,80 |:0,21 y=380 The oryginal price is 380$