A book sold 31,100 copies in its first month of release. Suppose this represents 7.8% of the number of copies sold to date. How many copies have been sold to date?

Round your answer to the nearest whole number.

Question

Rubi Grant

Mathematics

Today, 20:54

A book sold 31,100 copies in its first month of release. Suppose this represents 7.8% of the number of copies sold to date. How many copies have been sold to date?

Round your answer to the nearest whole number.

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Answers (1)

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Salvador Banks · Answer 1

For this problem you can create a proportion.

Since 31,100 copies is 7.8% of the total copies spoke up to date you can make this proportion:

31,100. 7.8%

-- - =. - --

x. 100%

Now you cross multiply and you will get

7.8x=3,110,000

After this you solve for x by isolating the variable.

7.8x/7.8. 3,110,000/7.8

x=398,717.949

Since the question asks you to round to the nearest whole number which is 7 then the final answer would be 398,718

Answer: There has been 398,718 copies sold to date.

A book sold 31,100 copies in its first month of release. Suppose this represents 7.8% of the number of copies sold to date. How many copies have been sold to date?Round your answer to the nearest whole number.

A book sold 31,100 copies in its first month of release. Suppose this represents 7.8% of the number of copies sold to date. How many copies have been sold to date?

Round your answer to the nearest whole number.