During a sale, there is a discount of 7% on a television set. If the discount is $49, find a. The marked price, of the television set.
b. The sale price

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Common knowledge - Russia became a communist country in 1917. It is very well-known that the Russian Revolution started in 1917, abolishing the monarchy and creating the communist Soviet Union.Needs documentation - In To Kill a Mockingbird the author intends the children's snowman to be a symbol. This is referring to particular element of a particular book, and therefore would require further information.Common knowledge - Pablo Picasso painted abstracts. Most people are at least slightly familiar with Picasso's work. He is always a reference in terms of Cubism, collage, and abstract painting.Common knowledge - U.S. presidential elections take place every four years. You could argue that every American citizen is expected to know this.Needs documentation - "Ask not what your country can do for you; ask what you can do for your country." This needs documentation because the author of this quote (John F. Kennedy during his inauguration speech) is missing. Needs documentation - An analysis of the use of color in a Da Vinci painting. This sentence is also incomplete. Not only is it not a statement of fact, it is also lacking specifications such as which painting we are talking about.