8 is 40% of what number? Please show your work

2 answers:

6 0

8 = 40%

Divide each side by 2.

4 = 20%

Multiply each side by 5.

4*5 = 20

20*5 = 100

8 is 40% of 20.

Check:

20 * 0.4 = 8

KengaRu [80]3 years ago

5 0

Do a proportion
40/100= 8/x
8 x 100= 800
Cross multiply and divide
800 divided by 40= 20
So answer is 20

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The mean of the total payments she will receive is $79,500.

The standard deviation of the total payments she will receive is $14,000.

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Given : An author receives a contract from a publisher, according to which she is to be paid a fixed sum of $20,000 plus $3.50 for each copy of her book sold. The author judges that her uncertainty about total sales of the book can be represented by a random variable with a mean of 17,000 and a standard deviation of 4,000 books.

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Let 'x' represent total sales of the book.

Let 'y' represent the payment to the author.

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The mean of the total payments she will receive is given by,

$\mu_y=20,000+3.50\mu_x$