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3 years ago

$3.25 marked up by 30% how do i work it out

Mathematics

2 answers:

cestrela7 [59]3 years ago

7 0

Answer:

multiply 3.25 by .3 on your calculator than add the result to 3.25, the answer is 4.23 ps: Orlandob007 on insta

Step-by-step explanation:

every time yiu have to mark up or mark down by a percentage move the decimal point 2 times from right to left ex. 30% ->.3

Blizzard [7]3 years ago

3 0

You multiply $3.25 by .30 and you get $0.98. Add that to the $3.25 and you get your answer: $4.23. Hope this helps!

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Answer:

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Step-by-step explanation:

Probability of an event E to be;

P(E) = $\frac{Number of events within E}{Total number of possible outcomes}$

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Total number of possible outcomes = 52 cards.

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From the given condition:

P(D) = $\frac{26}{52}$ [Out of 52 cards, 26 were black] ,

P(F) = $\frac{4}{52}$ [Out of 52 cards, there are four 10 cards]

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$P(A \cup B) = P(A)+P(B)-P(A \cap B)$

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$P(D \cup F')=P(D)+P(F')-P(D \cap F')$ ......[1]

First find the P(F');

P(F') =1-P(F) = $1-\frac{4}{52} =\frac{52-4}{52} =\frac{48}{52}$

Also, to find $P(D \cap F')$ .

We use the formula :

For any event A and B independent variable.

$P(A \cap B) =P(A) \cdot P(B)$

then;

$P(D \cap F') =P(D) \cdot P(F') = \frac{26}{52} \cdot \frac{48}{52} =\frac{24}{52}$

Now, substitute these in [1];

$P(D \cup F')=\frac{26}{52} +\frac{48}{52} -\frac{24}{52}$ = $\frac{26+48-24}{52} =\frac{50}{52} = \frac{25}{26}$

Therefore, the probability of $P(D \cup F')=\frac{25}{26}$

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