After a 80% reduction, you purchase a new washing on sale for $100. what was the original price of the washing machine?

Can someone pls ! pls answer all. no explanation needed..

Could somebody me with this radical simplification?

The art class is planning to paint a mural on an outside wall. this figure is a scale drawing of the wall. width: 11 in length: 28 in unit rate: 1.5 ft per in. write the ratio of the area of the drawing to the area of the actual mural. write your answer as a unit rate. show that this unit rate is equal to the square of the unit rate 1.5 ft per in